NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms
NCERT solutions for class 7 science chapter 10 respiration in organisms: This chapter is very important, as in this you will learn about respiration. It is essential for the survival of living organisms and it helps in the release of energy from food. In the CBSE NCERT solutions for class 7 science chapter 10 respiration in organisms, you will get questions from different types of respiration and its processes. You will study that oxygen you inhale is used to breakdown glucose into carbon dioxide along with water and in this process energy releases. This breakdown of glucose occurs in the cells of an organism, that's why it is also called cellular respiration and if the food is broken down with the help of oxygen, then it will be called aerobic respiration and without the use of oxygen, it will become anaerobic respiration. In solutions of NCERT for Class 7 Science Chapter 10 Respiration in Organisms, you have to study breathing, as it is a part of the process of respiration during which an organism takes in the oxygen-rich air and gives out air rich in carbon dioxide, as based on this you will get questions in NCERT solutions for class 7 science chapter 10 respiration in organisms. If you need help in finding solutions of NCERT book to any other class, then don't worry NCERT solutions will help you out.
Here are the important topics of CBSE NCERT solutions for class 7 science chapter 10 respiration in organisms mentioned below:
10.1 Why Do We Respire?
10.2 Breathing
10.3 How Do We Breathe?
10.4 What Do We Breathe Out?
10.5 Breathing in Other Animals
10.6 Breathing Under Water
10.7 Do Plants Also Respire?
After going through the solutions for NCERT class 7 science chapter 10 respiration in organisms, you must be able to understand all the answers the following questions:
NCERT solutions for class 7 science chapter 10 respiration in organisms: Solved Exercise Questions:
Q1. Why does an athlete breathe faster and deeper than usual after finishing the race?
Answer:
The muscles of an athlete undergo anaerobic respiration which means the oxygen is used up faster than being supplied by the blood.
Thus, to inhale more oxygen, an athlete breathes faster and deeper than usual after finishing the race.
Q2. List the similarities and differences between aerobic and anaerobic respiration.
Answer:
The similarities between aerobic and anaerobic respiration are:
(i) Carbon dioxide is produced in both reactions.
(ii) Energy is released in both reactions.
The differences between aerobic and anaerobic respiration are:
| Aerobic | Anaerobic |
| Takes place in the presence of oxygen | Takes place without oxygen |
| Complete break down of food | Partial break down of food |
| Carbon dioxide and water as the end product |
Ethanol, carbon dioxide as the end product(in yeast) |
| Produces more energy | Produces less energy |
Q3. Why do we often sneeze when we inhale a lot of dust-laden air?
Answer:
Sneezing removes the foreign particle like dust particles, smoke from the air inhaled which ensures good air quality inside our body.
When we inhale, unwanted particles get trapped in the hair present in our nasal cavity. However, sometimes these particles may get past the hair causing irritation in the lining of the cavity. This causes sneezing.
Answer:
We know,
Snail will inhale oxygen and exhale carbon dioxide whereas the plant will inhale carbon dioxide for respiration.
The test with snail and without plant will have maximum carbon dioxide concentration. Therefore, the order of test tube containing
is
.
Hence, test-tube
A
will have the highest concentration of
.
(a) In cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) spiracles
(iv) skin
Answer:
A cockroach has small openings called spiracles on the sides of its body.
Therefore, (a) In cockroaches, air enters the body through (iii) spiracles
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water
Answer:
(b) During heavy exercise, we get cramps in the legs due to the accumulation of (ii) lactic acid
During heavy exercise, muscle cells respire anaerobically because oxygen is used faster as compared to its supply by the blood. The partial breakdown of glucose produces lactic acid whose accumulation causes muscle cramps.
(c) Normal range of breathing rate per minute in an average adult person at rest is:
(i) 9–12
(ii) 15–18
(iii) 21–24
(iv) 30–33
Answer:
Normal range of breathing rate per minute in an average adult person at rest is (ii) 15–18
This means on an average, an adult human being breathes in and out 15–18 times in a minute.
(d) During exhalation, the ribs
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all
Answer:
During exhalation, the ribs (ii) move downwards
During exhalation, ribs move down and inwards reducing the size of the chest cavity causing the air to be pushed out of the lungs.
Q6. Match the items in Column I with those in Column II:
Column I Column II
(a) Yeast (i) Earthworm
(b) Diaphragm (ii) Gills
(c) Skin (iii) Alcohol
(d) Leaves (iv) Chest cavity
(e) Fish (v) Stomata
(f) Frog (vi) Lungs and skin
(vii) Tracheae
Answer:
| Column I | Column II |
|
(a) Yeast |
(iii) Alcohol |
|
(b) Diaphragm |
(iv) Chest cavity |
|
(c) Skin |
(i) Earthworm |
|
(d) Leaves |
(v) Stomata |
|
(e) Fish |
(ii) Gills |
|
(f) Frog |
(vi) Lungs and skin |
Q7. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) During heavy exercise the breathing rate of a person slows down. (T/F)
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
(iii) Frogs breathe through their skins as well as their lungs. (T/F)
(iv) The fishes have lungs for respiration. (T/F)
(v) The size of the chest cavity increases during inhalation. (T/F)
Answer:
(i) During heavy exercise the breathing rate of a person slows down. False
- During heavy exercise, we breathe faster and deeper than usual
(ii) Plants carry out photosynthesis only during the day and respiration only at night.
False
- Respiration is an essential process required for the plants to live. It occurs day and night. Whereas, photosynthesis takes place only during the day.
(iii) Frogs breathe through their skins as well as their lungs.
True
(iv) The fishes have lungs for respiration.
False
- Fishes do not have lungs. They breathe through gills.
(v) The size of the chest cavity increases during inhalation.
True
- During inhalation, ribs move up and outwards and the diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs.
(i) The air tubes of insects
(ii) Skeletal structures surrounding chest cavity
(iii) Muscular floor of chest cavity
(iv) Tiny pores on the surface of leaf
(v) Small openings on the sides of the body of an insect
(vi) The respiratory organs of human beings
(vii) The openings through which we inhale
(viii) An anaerobic organism
(ix) An organism with tracheal system
Answer:
(i) The air tubes of insects - TRACHEA
(ii) Skeletal structures surrounding chest cavity - RIBS
(iii) Muscular floor of chest cavity - DIAPHRAGM
(iv) Tiny pores on the surface of leaf - STOMATA
(v) Small openings on the sides of the body of an insect - SPIRACLES
(vi) The respiratory organs of human beings - LUNGS
(vii) The openings through which we inhale - NOSTRILS
(viii) An anaerobic organism - YEAST
(ix) An organism with tracheal system - ANT
Q9. The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.
(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.
Answer:
The mountaineers carry oxygen with them because the amount of oxygen availability to a person is less than that available on the ground. (b)
As we move higher in altitude, the density of the atmosphere lessens.
If you are facing any issue in understanding the answers of the above questions, then don't worry and again go through that NCERT Book and try to understand all the concepts of every topic and then write the answers of all these questions by your own and then compare them with NCERT solutions for class 7 science chapter 10 respiration in organisms . You will see that your knowledge, as well as the understanding of these concepts, will increase and you will be able to explain the answers in a better way.
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