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NCERT Exemplar Class 10 Science Solutions Chapter 7 Control and Coordination

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NCERT Exemplar Class 10 Science Solutions Chapter 7 Control and Coordination

Edited By Priyanka kumari | Updated on Sep 09, 2022 02:19 PM IST | #CBSE Class 10th

NCERT exemplar Class 10 Science solutions chapter 7 analyses and observe the movement of an organism. An important question that has always attracted philosophers in history was: “What is the reason for movement by any being and how it is controlled?”

Scientists and philosophers interpreted after the close observation that any motion or movement is the response to the environment. Keeping in mind the best process flow, our subject matter experts have painstakingly developed the NCERT exemplar Class 10 Science chapter 7 solutions. It contains the answers of all NCERT Class 10 Science Book Questions.

NCERT Exemplar Class 10 Science Solutions Chapter 7-MCQ

Question:1

Which of the following statements is correct about receptors?
(a) Gustatory receptors detect taste while olfactory receptors detect smell
(b) Both gustatory and olfactory receptors detect smell
(c) Auditory receptors detect smell and olfactory receptors detect taste
(d) Olfactory receptors detect taste and gustatory receptors smell

Answer: A
Solution: A receptor is a cell or group of cells that help in detecting external stimuli.
Gustatory receptors are taste receptors present on the papillae of the tongue. Olfactory receptors help in detecting smell and are present on the roof of the nasal cavity. Both the receptors send the information to the brain to interpret the stimulus and generate an appropriate response. Auditory receptors in ears help in detecting voices.

Question:2

Electrical impulse travels in a neuron from
(a) Dendrite \rightarrow axon \rightarrow axonal end \rightarrow cell body
(b) Cell body \rightarrow dendrite \rightarrow axon \rightarrow axonal end
(c) Dendrite \rightarrow cell body \rightarrow axon \rightarrow axonal end
(d) Axonal end \rightarrow axon \rightarrow cell body \rightarrow dendrite

Answer: C
Solution: The stimulus is received by dendrites and transmitted to cyton through axon from where it reaches the terminal branches called as axonal end from where they are transmitted to another neuron.

Question:3

In a synapse, chemical signal is transmitted from
(a) dendritic end of one neuron to axonal end of another neuron
(b) axon to cell body of the same neuron
(c) cell body to axonal end of the same neuron
(d) axonal end of one neuron to dendritic end of another neuron

Answer: D
Solution: Neurons communicate with one another at junctions called synapse. In a synapse, the electrical signal is converted into the chemical substance called as neurotransmitter by the presynaptic neuron.
This chemical diffuses across the synaptic cleft and reaches the other neuron. The signal thus travels from axonal end of one neuron to dendritic end of another neuron.

Question:4

In a neuron, conversion of electrical signal to a chemical signal occurs at/in
(a) cell body
(b) axonal end
(c) dendritic end
(d) axon

Answer: B
Solution: The signals are transferred from one neuron to another with the help of synapse. The electrical signals are very fast as compared to that of chemical signals. At the axonal end, the electrical signal is converted into a chemical signal with the help of chemical messengers called neurotransmitters that are received by the receptors present on the dendrites of another neuron.

Question:5

Which is the correct sequence of the components of a reflex arc?
(a) Receptors\rightarrow Muscles\rightarrow Sensory neuron\rightarrow Motor neuron\rightarrow Spinal cord
(b) Receptors\rightarrow Motor neuron \rightarrow Spinal cord \rightarrow Sensory neuron \rightarrow Muscle
(c) Receptors \rightarrow Spinal cord \rightarrow Sensory neuron \rightarrow Motor neuron \rightarrow Muscle
(d) Receptors \rightarrow Sensory neuron \rightarrow Spinal cord \rightarrow Motor neuron \rightarrow Muscle

Answer: D
Solution: The reflex arc is a neural pathway that controls a reflex. Reflex arc is a part of the PNS and is responsible for actions performed in response to certain stimuli, such as pulling a hand away from a hot object. Its consists of 5 components- a receptor that receives the initial stimulus, such as skin, muscles or organs, a sensory neuron that carries the signal to the central nervous system (the spinal cord), an interneuron that relays the information to the central nervous system, and one or more motor neurons that relay the information to the final component of the arc, the effector. The effector could be a muscle, a gland or both.

Question:6

Which of the following statements are true?
(i) Sudden action in response to something in the environment is called reflex action
(ii) Sensory neurons carry signals from spinal cord to muscles
(iii) Motor neurons carry signals from receptors to spinal cord
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc \
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i) , (ii) and (iii)

Answer: C
Solution: The statements (ii) and (iii) are false because sensory neurons carry signals from receptors to spinal cord and motor neurons carry signals from spinal cord to the muscles.
The statement (i) and (iv) are true.

Question:7

Which of the following statements are true about the brain?
(i) The main thinking part of brain is hind brain
(ii) Centres of hearing, smell, memory, sight etc are located in fore brain.
(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain
(iv) Cerebellum does not control posture and balance of the body
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Answer: C
Solution: Hindbrain forms the lower part of brain stem and it consists of medulla oblongata, pons, and cerebellum.
Medulla oblongata controls involuntary actions such as heartbeat, breathing etc. Cerebellum helps in maintaining posture, balance, and equilibrium. Cerebrum forms part of the forebrain and is the main thinking part of the brain. It coordinates the voluntary actions of the body. It has different areas for performing functions such as centres of hearing, smell , memory, etc.

Question:8

Posture and balance of the body is controlled by
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons

Answer: B
Solution: Cerebellum is the part of the hindbrain and plays a major role in coordinating voluntary motor movements of the body. It also helps in maintaining balance and equilibrium. Cerebellar damage causes disorder in coordination, speed, posture and motor learning.

Question:9

Spinal cord originates from
(a) cerebrum
(b) medulla
(c) pons
(d) cerebellum

Answer: B
Solution: The brain is subdivided into cerebrum, thalamus, hypothalamus, cerebellum and brain stem. Brain stem consists of midbrain, pons and medulla oblongata. The medulla oblongata is the lowest part of the brain stem from where the spinal cord originates. Spinal cord is a long cylindrical structure consisting of bundle of nerve fibres, running through the vertebral column of the backbone.

Question:10

The movement of shoot towards light is
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism

Answer: D
Solution: Tropism is the growth in response to external stimuli. Geotropism is the growth of roots towards the gravitational force of the earth. Hydrotropism is the growth of shoots towards water. Chemotropism is the growth of shoots towards the chemical stimulus. Phototropism is the growth of shoots towards the direction of the light.

Question:11

The main function of abscisic acid in plants is to
(a) increase the length of cells
(b) promote cell division
(c) inhibit growth
(d) promote growth of stem

Answer: C
Solution: Abscisic acid is the plant hormone. It is also called as stress hormone because it shows different responses in the stress conditions. It leads to the seed dormancy and ensures seed germination only when favourable conditions return. It also causes the closing of stomata when plant doesn’t get enough water.

Question:12

Which of the following is not associated with growth of plant?
(a) Auxin
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid

Answer:

Answer: D
Solution: Abscisic acid is the stress hormone that causes different plant responses acting against stress conditions. It is responsible for dormancy of seeds and inhibition of seeds. It stimulates the closure of stomata, inhibit shoot growth, stimulate the storage of proteins in seeds, and so on.

Question:13

Iodine is necessary for the synthesis of which hormone?
(a) Adrenaline
(b) Thyroxin
(c) Auxin
(d) Insulin

Answer: B
Solution: Thyroid gland secretes a hormone thyroxine or T4 into the bloodstream. The major function of the thyroid gland is to produce thyroid hormones required by the body for metabolism. Iodine is required to make thyroid hormone. If iodine is not available in the diet, the thyroid gland may produce an insufficient amount of hormone.

Question:14

Choose the incorrect statement about insulin
(a) It is produced from pancreas
(b) It regulates growth and development of the body
(c) It regulates blood sugar level
(d) Insufficient secretion of insulin will cause diabetes

Answer:

The answer is option (b)
AS insulin doesn't regulate the growth and development of the body.

Question:15

Select the mis-matched pair
(a) Adrenaline : Pituitary gland
(b) Testosterone: Testes
(c) Estrogen : Ovary
(d) Thyroxin : Thyroid gland

Answer: A
Explanation: Adrenaline is a hormone produced by the adrenal glands and triggers the body's fight-or-flight response while pituitary gland produces growth hormone.
Testosterone is a hormone produced by the testes in males and is responsible for the development of male sexual characteristics.
Estrogen is produced by ovaries in the females and is responsible for the development of female sexual characteristics.
Thyroxine is produced by thyroid gland whose function is to regulate the metabolism in the cells of the body.

Question:16

The shape of guard cells changes due to change in the
(a) protein composition of cells
(b) temperature of cells
(c) amount of water in cells
(d) position of nucleus in the cells

Answer: C
Solution: Stomata is a pore like structure present on the epidermis of the leaves. It is guarded by the guard cells that help to regulate the rate of transpiration by opening and closing the stomata. If the guard cells are turgid or swollen, the stomatal opening is large. This turgidity is caused by the accumulation of K+ ions in the guard cells.
As K+ levels increase in the guard cells the water potential of the guard cells drops and water enters the guard cells. In the second case, the guard cells have lost water, which causes the cells to become flaccid and the stomatal opening to close. This may occur when the plant has lost an excessive amount of water.

Question:17

The growth of tendril in pea plants is due to
(a) effect of light
(b) effect of gravity
(c) rapid cell divisions in tendrillar cells that are away from the support
(d) rapid cell divisions in tendrillar cells in contact with the suppor

Answer: C
Solution: Pea plants grow in winters when the days are shorter and the exposure to sunlight is less. Tendrils are hair-like structures that grow with the help of any support so, they are not seen to grow with the impact of gravity.
On the other hand, tendrils that come in contact with the side of the object grows slowly and the side opposite to it is seen to grow at a very fast rate which causes rapid division of cells on the opposite side. This causes tendril to bend to the side where it touches the object and helps in clinging and does not flow with the wind.

Question:18

The growth of pollen tubes towards ovules is due to
(a) hydrotropism
(b) chemotropism
(c) geotropism
(d) phototropism

Answer: B
Solution: Chemotropism is growth towards the chemical stimulus. For fertilization to take place, pollen grains follow chemotropic mechanism where the growth of the pollen tube is towards the ovules. During fertilization, ovary release chemicals that trigger the chemotropic response from developing pollen tube. Hydrotropism is growth towards water, phototropism is towards the light, and geotropism is towards force of gravity.

Question:19

The movement of sunflower in accordance with the path of sun is due to
(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism

Answer: A
Solution: Tropism is growth towards an external stimulus. It is of different types. In phototropism, the growth of plant is towards the direction of light. Thus, the movement of sunflower in accordance with the path of sun is due to phototropism.

Question:20

The substance that triggers the fall of mature leaves and fruits from plants is due to
(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin

Answer: C
Solution: Abscisic acid is a plant hormone that plays an important role under stress conditions. It promotes senescence of leaves and causes abscission of flowers and fruits by forming a layer of abscission. This layer disconnects the living tissue of leaf from the other parts.

Question:21

Which of the following statements about transmission of nerve impulse is incorrect?
(a) Nerve impulse travels from dendritic end towards axonal end
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells

Answer: C
Solution: Sensory neurons carry the nerve impulses generated at the sensory receptor towards the CNS. The nerve impulse is transmitted through the axon of one neuron to the dendrite of another neuron. At the end of the axon, neurotransmitters are released which flow through the synapse to the dendrite of another neuron.

Question:22

Involuntary actions in the body are controlled by
(a) medulla in fore brain
(b) medulla in mid brain
(c) medulla in hind brain
(d) medulla in spinal cord

Answer: C
Solution: The medulla oblongata is located in the hindbrain. It is a cone-shaped structure that forms the lower part of the brain stem and connects the brain to the spinal cord. It performs various functions of the autonomous nervous system (ANS) like:
  • heart rate,
  • breathing,
  • swallowing,
  • sneezing and
  • digestion
by the sympathetic and parasympathetic response.

Question:23

Which of the following is not an involuntary action?
(a) Vomiting
(b) Salivation
(c) Heart beat
(d) Chewing

Answer: D
Solution: Involuntary actions are not under the control of a person’s will. Vomiting, salivation and heart beat are controlled by the autonomous nervous system and are therefore involuntary in nature. While chewing is a voluntary action that a person performs according to his/ her will and involves skeletal muscles which are voluntary.

Question:24

When a person is suffering from severe cold, he or she cannot
(a) differentiate the taste of an apple from that of an ice cream
(b) differentiate the smell of a perfume from that of an agarbatti
(c) differentiate red light from green light
(d) differentiate a hot object from a cold object

Answer: B
Solution: Common cold is a respiratory disease that involves the clogging of the nose with phlegm. It results in the blockage of the perception of smell. The olfactory receptors fail to send the olfactory signals to the nose as a result of which a person won't be able to differentiate between the smell of agarbatti and perfume.

Question:25

What is the correct direction of flow of electrical impulses?

Answer: C
Solution: For the generation of nerve impulses, nerve cells should be in contact with each other. The nerve impulse is transmitted in the following sequence:
Axon end- synapse- dendrites- dendron- cyton- axon body- axon end.
The nerve impulse travels in the form of electrical signals from one end of the axon to the synapse. At the synaptic cleft, the electrical impulse is converted to the chemical impulse. Further, this nerve impulse flows from the synaptic cleft to dendritic tips, converting the chemical impulse to electrical impulse. Thus, the flow of impulse is always from one axonal end of a neuron to dendronal end of another neuron.

Question:26

Which statement is not true about thyroxin?
(a) Iron is essential for the synthesis of thyroxin
(b) It regulates carbohydrates, protein and fat metabolism in the body
(c) Thyroid gland requires iodine to synthesise thyroxin
(d) Thyroxin is also called thyroid hormone

Answer: A
Solution: Thyroid gland produces a hormone called thyroxine into the bloodstream. It regulates the rate of metabolism in the body. Iodine is necessary for the production of thyroid hormones- T3 and T4.

Question:27

Dwarfism results due to
(a) Excess secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of growth hormone

Answer: B
Solution: The pituitary gland releases growth hormone (GH) also called as somatostatin. The over-secretion of GH stimulates abnormal growth of the body leading to gigantism and low secretion of GH results in stunted growth resulting in dwarfism. The symptoms of dwarfism include shortened arms and legs, a short neck, broad, rounded chest, slightly flattened cheekbones, slow growth pattern and unusually small stature.

Question:28

Dramatic changes of body features associated with puberty are mainly because of secretion of
(a) oestrogen from testes and testosterone from ovary
(b) estrogen from adrenal gland and testosterone from pituitary gland
(c) testosterone from testes and estrogen from ovary
(d) testosterone from thyroid gland and estrogen from pituitary gland

Answer: C
Solution: Puberty leads to dramatic physical and mental changes in the body of a person. It is the transition stage towards attaining sexual maturity. Sex hormones play a key role here.
In humans, testosterone is the male hormone produced by testes that promotes the development of secondary sexual characteristics. While Oestrogen produced by the ovaries in the females is responsible for the development of secondary sexual characters in females.

Question:29

A doctor advised a person to take an injection of insulin because
(a) his blood pressure was low
(b) his heart was beating slowly
(c) he was suffering from goitre
(d) his sugar level in blood was high

Answer: D
Solution: The specialised cells called as beta cells in Islets of Langerhans in the pancreas produce insulin. It plays a key role in absorption of blood sugar by the cells. Thus, the patient who is advised to take insulin injections might be suffering from high blood sugar level in the body.

Question:30

The hormone which increases the fertility in males is called
(a) oestrogen
(b) testosterone
(c) insulin
(d) growth hormone

Answer: B
Solution: Testosterone is the male sex hormone produces in testes of males which promotes maleness. It helps in promoting spermatogenesis, the process of production of sperm. It also promotes secondary sexual characteristics in case of males.

Question:31

Which of the following endocrine glands is unpaired?
(a) Adrenal
(b) Testes
(c) Pituitary
(d) Ovary

Answer: C
Solution: Except pituitary, all endocrine glands given here are paired in nature.
Adrenal glands are paired present on the top of each kidney. Testes is a paired gland in males which produces male sex hormones. Ovary is a paired gland in females, which produces female sex hormones. Pituitary gland is unpaired and present below the brain. It is also called as master gland as it secretes number of hormones.

Question:32

Junction between two neurons is called
(a) cell junction
(b) neuro muscular junction
(c) neural joint
(d) synapse

Answer: D
Solution: In the nervous system, a synapse is a junction between two neurons where there is a small gap that allows a neuron to pass an electrical or chemical signal to another neuron.
Cell junction provides contact between neighbouring cells. The neuromuscular junction is a synapse between the axon terminals of a motor neuron and a muscle fibre while the neural joint is present in the nervous system.

Question:33

In humans, the life processes are controlled and regulated by
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems

Answer: D
Solution: Reproductive, respiratory and digestive systems have no role to play in control and regulation of the life processes. It is the nervous system and the endocrine system that control and regulates all the processes including reproductive, respiratory and digestive systems.
Nervous system consists of a network of neurons that allows signals to move between the brain and body. The endocrine system releases hormones into the body that regulates a variety of functions such as metabolism, digestion, blood pressure and growth. The endocrine system is not directly linked to the nervous system. They two interact in different ways.

NCERT Exemplar Class 10 Science Solutions Chapter 7-Short Answer

Question:34

Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in Figure 7.2.


Answer:

(a) Sensory neuron- It receives the signals (heat) from the stimulus (hot pan) and carries it directly to the spinal cord.
(b) Spinal cord (CNS)- It is a cylindrical structure that carries bundles of nerve fibres. It receives the signal from the sensory neurons and processes and sends them back through the motor neurons.
(c) Motor neuron- It transmits the signals to the effector muscle (muscle in arm) so that the muscle can take action immediately.
(d) Effector (Muscle in arm)- They act in response to the stimuli and shows contraction.

Question:35

Name the plant hormones responsible for the following
(a) elongation of cells
(b) growth of stem
(c) promotion of cell division
(d) falling of senescent leaves.

Answer:

(a) Auxin helps in the elongation of cells
(b) Gibberlin help in the growth of stem
(c) Cytokinin help in promotion of cell division
(d) Abscisic acid leads to falling of senescent leaves.

Question:36

Label the endocrine glands in Figure 7.3.

Answer:

a) Pineal Gland- It is located in the brain and produces a hormone called as melatonin.
b) Pituitary gland- It is called as the master gland because it controls the secretions of other glands and releases various hormones like growth hormone.
c) Thyroid gland- It secretes hormone thyroxine which helps in regulating the metabolism of the body.
d) Thymus- It produces a hormone thymosin which stimulates the development of T-cells.

Question:37

In Figure 7.4 (a), (b) and (c), which appears more accurate and why?

Answer:

Figure a) is more accurate. The roots of a plant always grow downwards in response to the gravity and in figure a plant root shows positive geotropism. While the shoot of the plant shows positive phototropism. By growing towards the light.

Question:38

Label the parts of a neuron in Figure 7.5.

Answer:

a) Dendrite- These are the branch like structures that receives messages from other neurons and help in the transmission of impulses to the cell body.
b) Cellbody-It is also called as soma. It is a star shaped structure with a nucleus, golgi body, endoplasmic reticulum, mitochindria etc.
c) Axon- It is a tube-like structure that carries electrical impulse from the cell body to the axon terminals that passes the impulse to another neuron.
d) Axon terminal- It is the end of an axon that helps in the tranmission of electrical impulse to the dendrites of another neuron.

Question:39

Match the terms of Column (A) with those of Column (B)Column (A) Column (B)
(a) Olfactory receptors (i) Tongue
(b) Thermo receptors (temperature receptors) (ii) Eye
(c) Gustatoreceptors (iii) Nose
(d) Photoreceptors (iv) Skin

Answer: (a)- 3. (b)-4, (c)-1, (d)-2
Sensory receptors are nerve receptors present in different organs of a body and respond to stimulus. Olfactory receptors, thermoreceptors, gustatory receptors, photoreceptors are different sensory receptors. Olfactory receptors present in the nose helps to recognise different types of smell. Thermoreceptors are non-specialised sensory neurons which connect the skin to the hypothalamic region of the brain and detects temperature change. Gustatory receptors also called taste receptors are present in the tongue and detects taste. Photoreceptors are present in eyes. There are two types of photoreceptors, i.e, rods and cones. They contain coloured pigments which help to differentiate between colours.

Question:40

What is a tropic movement? Explain with an example.

Answer:

Tropic movement is the directional growth of the plant in response to the external stimulus present in the environment, this movement is in response to root and shoot growth. Movement can be either toward the stimulus or away from the stimulus. They are mainly of five types:
Phototropism,
  • Geotropism,
  • Chemotropism,
  • Hydrotropism and
  • Thigmotropism
Ex: Roots shows positive geotropic movement as they grow downwards the gravity whereas shoots show negative geotropic movement.

Question:41

What will happen if intake of iodine in our diet is low?

Answer:

Iodine is essential for the synthesis of hormone thyroxin. The thyroid gland secretes a hormone thyroxin which controls the rate of metabolism of carbohydrates, fats and proteins in the body. If there is a deficiency of iodine then there will be a deficiency of thyroxine hormone in the body and will cause goitre. The neck appears to be swollen due to enlargement of the thyroid gland which is also called a goitre.

Question:42

What happens at the synapse between two neurons?

Answer:

The transmission of nerve impulses between two neurons takes place through the synapse. The axon terminal of a neuron releases chemical substances called neurotransmitters e.g. acetylcholine. These chemicals travel through the synapse and reach the dendrites of the next neuron. The nerve impulses travel along with the neurotransmitters.

Question:43

Answer the following :
(a) Which hormone is responsible for the changes noticed in females at puberty?
(b) Dwarfism results due to deficiency of which hormone?
(c) Blood sugar level rises due to deficiency of which hormone?
(d) Iodine is necessary for the synthesis of which hormone?

Answer:

(a) Oestrogen hormone is responsible for the changes noticed in females at puberty.
(b) Dwarfism results due to deficiency of growth hormone.
(c) Blood sugar level rises due to deficiency of Insulin hormone.
(d) lodine is necessary for the synthesis of Thyroxine hormone.

Question:44

Answer the following :
(a) Name the endocrine gland associated with brain?
(b) Which gland secretes digestive enzymes as well as hormones?
(c) Name the endocrine gland associated with kidneys?
(d) Which endocrine gland is present in males but not in females?

Answer:

a) Pitutary gland is associated with brain.
b) Pancreas secretes digestive enzymes as well as hormones.
c) Adrenal gland is associated with kidneys.
d) Testis is present in males but not in females.

NCERT Exemplar Class 10 Science Solutions Chapter 7-Long Answer

Question:45

Draw the structure of a neuron and explain its function.

Answer:

Solution:
Neurons are the building blocks of the nervous system. They receive and transmit signals to different parts of the body. There are different types of neurons that help in the transmission of information. Following are the different parts of a neuron:
Dendrites
These are branch-like structures that receive messages from other neurons and allow the transmission of messages to the cell body.
Cell Body
Each neuron has a cell body with a nucleus, Golgi body, endoplasmic reticulum, mitochondria and other components.
Axon
Axon is a tube-like structure that carries electrical impulse from the cell body to the axon terminals that passes the impulse to another neuron.
Mylein sheath acts as an insulator around the axon. It insulates axons from the electrical impulses from the surroundings.

Question:46

What are the major parts of the brain? Mention the functions of different parts.

Answer:

The major parts of the human brain are-
Cerebrum: The cerebrum is the largest part of the human brain. It is divided into two hemispheres; called cerebral hemispheres. The cerebrum controls voluntary motor actions. It is the site of sensory perceptions and the seat of learning and memory.
Hypothalamus: The hypothalamus lies at the base of the cerebrum. It controls sleep and wake cycle of the body. It also controls the urge for eating and drinking.
Cerebellum: Cerebellum lies below the cerebrum and at the back of the whole structure. It is responsible for the voluntary actions of the body and helps in maintaining the equilibrium of the body
Medulla: Medulla forms the brain stem; along with the pons. It lies at the base of the brain and continues into the spinal cord. The medulla controls various involuntary functions: like a heartbeat, respiration, etc.

Question:47

What constitutes the central and peripheral nervous systems? How are the components of central nervous system protected?

Answer:

The central nervous system consists of brain and the spinal cord. The peripheral nervous system consists of all the nerves in the body that lies outside of the spinal cord and brain.
The central nervous system has a well-developed system for its protection. Brain is enclosed in a hard shell know as skull. Spinal cord is enclosed in vertebral column for its protection. Along with these there is cerebrospinal fluid which protects the brain from mechanical shocks.

Question:48

Mention one function for each of these hormones :
(a) Thyroxin
(b) Insulin
(c) Adrenaline
(d) Growth hormone
(e) Testosterone.

Answer:

(a) Thyroxin regulates carbohydrate, protein and fat matabolism in the body so as to provide the best balance for growth.
(b) Insulin regulates blood sugar levels in the body.
(c) Adrenaline increases heart rate and supply of blood to various organs.
(d) Growth hormone regulates growth and development in the body.
(e) Testosterone controls the changes of body features associated with puberty in male.

Question:49

Name various plant hormones. Also give their physiological effects on plant growth and development.

Answer:

Auxin - it promotes plant growth and fruit growth.
Gibberlins- it helps in fruit growth and cell division.
Cytokinins –it promotes cell division, fruit growth and opening of stomata.
Abscisic acid- it promotes dormancy and inhibits plant growth. It is also responsible for the falling of leaves fruits and flowers

Question:50

What are reflex actions? Give two examples. Explain a reflex arc.

Answer:

The sudden involuntary movement in a voluntary organ; in response to a stimulus; is called reflex action.
Examples of reflex action:
  • (a) Moving your hand away from a hot pan.
  • (b) Blinking of eyes
Reflex Arc: Reflex arc is a path of electrical impulse during a reflex action. It is composed of sensory neuron, spinal cord, motor neuron and
muscle.
Steps of reflex arc
• The sensory neuron picks signals from the stimulus and carries the signals to the spinal cord.
• Spinal cord process the signals and sends the message through the motor neuron.
• Motor neuron transmits the signals to the effector's muscle so that the muscle can take immediate action

Question:51

“Nervous and hormonal systems together perform the function of control and coordination in human beings.” Justify the statement.

Answer:

The control and coordination in human beings is because of nervous and endocrine system. These two systems work in different ways. Brain controls all the functions of the body with the help of network of neurons which carry signals through neurotransmitters in the form of electric impulses to the brain and from the brain. The hormonal system consists of hormones secreted by various glands in our body.
Hormonal system coordinates the function of nervous system. Hormones indirectly control the life processes by feedback mechanism. They can produce hormones when required and can stop production when not required.

Question:52

How does chemical coordination take place in animals?

Answer:

The chemical coordination in animals take place through hormones produced by the ductless glands i.e. endocrine glands of the body. Hormones are directly released into blood stream to reach the target site. Hormones control the behavior of the target tissue.
Example: Adrenaline hormone is secreted by the adrenal gland which reaches the heart, lungs and gastro intestinal tract. Heart speeds up its pumping action so that more blood could be supplied to the limbs and facial muscles. But activity of the GI tract is slowed down to ensure better blood supply in limbs. Thus, adrenalin prepares the body for a fight or flight situation

Question:53

Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?

Answer:

The electrical signal travels through a neuron. In order to be transmitted to another neuron, it needs to be passed in the form of neurotransmitters. Neurotransmitters are chemical substances that can enter a neuron only through specialized channels which are present only in dendrites not in axons.
Due to this, the flow of signals in a synapse is from the axonal end of one neuron to dendritic end of another neuron but not the reverse.

These NCERT exemplar Class 10 Science chapter 7 solutions form a more solid understanding of control and coordination because of their comprehensive nature. The CBSE Syllabus for Class 10 chapter 7 is incorporated in the NCERT exemplar Class 10 Science chapter 7 solutions.

NCERT Exemplar Solutions Class 10 Science Chapter 7 Important Topics:

NCERT exemplar Class 10 Science solutions chapter 7 explores the key topics mentioned below:

  • How the coordination and control work.
  • NCERT exemplar Class 10 Science solutions chapter 7 discusses the nervous system and how an electric impulse travels in neurons.
  • In this chapter, we will learn about receptor cells which gives a sense of taste or smell
  • Different behaviors of movement of different kinds of plants such as the growth of sunflower towards the sun.

NCERT Class 10 Exemplar Solutions for Other Subjects:

NCERT Class 10 Science Exemplar Solutions for Other Chapters:

Features of NCERT Exemplar Class 10 Science Solutions Chapter 7:

These Class 10 Science NCERT exemplar chapter 7 solutions discuss the control and coordination in living organisms such as animals and plants.

In order to hone the knowledge required to practice the problems based on Control and Coordination, students are suggested to refer to these solutions.

Class 10 Science NCERT exemplar solutions chapter 7 Control and Coordination will help develop a clear understanding of the concept leading to an effortless sailing through other books such as Biology question bank, S Chand Lakhmir Singh Biology Class 10 and NCERT Class 10 Science.

Check NCERT Solutions for questions given in the book

Must check NCERT Solution Subject Wise

Read more NCERT Notes Subject Wise

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Question (FAQs)

1. Q1. What is insulin?

A1. It is a hormone that is created in the pancreas. It helps the body to get energy from sugars or carbohydrates

2. Q2. What is phototropism?

A2. The growth of shoot towards the sun is called phototropism

3. Q3. What is a neuron?

A3. Neurons are the basic fundamental part of the brain. It is responsible for passing information from one cell to another of the nervous system. Generally, it has three parts: dendrites, Cell body, and axons.

4. Q4. Is Control and Coordination an important chapter while preparing for board examination?

A4. Yes, for a student aspiring for high scores and strong foundation each and every chapter should matter. Control and Coordination constitutes about 6-8 % marks of the whole paper which can be aced with the help of NCERT exemplar Class 10 Science solutions chapter 7.

5. Q5. Are these solutions of Control and Coordination available for download?

A5. Yes, NCERT exemplar Class 10 Science solutions chapter 7 pdf download feature through online tools, will allow you to download the pdf version of the solutions which can be used in case of low or no internet connectivity.

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Questions related to CBSE Class 10th

Have a question related to CBSE Class 10th ?

Dear aspirant !

Hope you are doing well ! The class 10 Hindi mp board sample paper can be found on the given link below . Set your time and give your best in the sample paper it will lead to great results ,many students are already doing so .

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://school.careers360.com/download/sample-papers/mp-board-10th-hindi-model-paper&ved=2ahUKEwjO3YvJu5KEAxWAR2wGHSLpAiQQFnoECBMQAQ&usg=AOvVaw2qFFjVeuiZZJsx0b35oL1x .

Hope you get it !

Thanking you

Hello aspirant,

The dates of the CBSE Class 10th and Class 12 exams are February 15–March 13, 2024 and February 15–April 2, 2024, respectively. You may obtain the CBSE exam date sheet 2024 PDF from the official CBSE website, cbse.gov.in.

To get the complete datesheet, you can visit our website by clicking on the link given below.

https://school.careers360.com/boards/cbse/cbse-date-sheet

Thank you

Hope this information helps you.

Hello aspirant,

The paper of class 7th is not issued by respective boards so I can not find it on the board's website. You should definitely try to search for it from the website of your school and can also take advise of your seniors for the same.

You don't need to worry. The class 7th paper will be simple and made by your own school teachers.

Thank you

Hope it helps you.

The eligibility age criteria for class 10th CBSE is 14 years of age. Since your son will be 15 years of age in 2024, he will be eligible to give the exam.

That totally depends on what you are aiming for. The replacement of marks of additional subjects and the main subject is not like you will get the marks of IT on your Hindi section. It runs like when you calculate your total percentage you have got, you can replace your lowest marks of the main subjects from the marks of the additional subject since CBSE schools goes for the best five marks for the calculation of final percentage of the students.

However, for the admission procedures in different schools after 10th, it depends on the schools to consider the percentage of main five subjects or the best five subjects to admit the student in their schools.

View All

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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3 Jobs Available
Automation Test Engineer

An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process. 

2 Jobs Available
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