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NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms

NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms

Edited By Priyanka kumari | Updated on Aug 25, 2022 05:23 PM IST | #CBSE Class 12th

NCERT exemplar Class 12 Biology solutions chapter 1 is definitely a good source of study material, especially for CBSE students studying biology in Class 12. These solutions are prepared only by qualified persons and expert teachers. It is highly recommended to follow NCERT exemplar Class 12 Biology solutions chapter 1 because it includes all the major questions that have definitely been asked in previous question papers. Content includes questions from various textbooks, guides, important worksheets, MCQ’s and various other HOTS (Higher Order Thinking Skills) questions. NCERT Exemplar Class 12 Biology solutions chapter 1 pdf download is available for students to help them understand the concepts better and also for offline use for free here.

Also, read NCERT Solutions for Class 12 Biology of Other Chapters.

NCERT Exemplar Class 12 Biology Chapter 1 Reproduction in Organisms

Multiple Choice Questions:

Question:1

A few statements describing certain features of reproduction are given below:
i. Gametic fusion takes place
ii. Transfer of genetic material takes place
iii. Reduction division takes place
iv. Progeny have some resemblance with parents

Select the options that are true for both asexual and sexual reproduction from the options given below:
(a) i and ii; (b ) ii and iii; (c) ii and iv; (d) i and iii.

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Answer:

The answer is the option (c) (ii) and (iv)
Explanation: Gametic fusion and reduction division take place only in case of sexual reproduction.

Question:2

The term 'clone' cannot be applied to offspring formed by sexual reproduction because:
a. Offspring do not possess exact copies of parental DNA
b. DNA of only one parent is copied and passed on to the offspring
c. Offspring are formed at different times
d. DNA of parent and offspring are completely different.

Answer:

The answer is the option a) Offspring do not possess exact copies of parental DNA

Explanation: Crossing Over takes place during meiosis and is responsible for some alteration in genotype. During fertilisation, gene pools of two different individuals combine to form a zygote, which has a different genotype than both of its parents. Hence, the term cannot be applied to offspring formed by sexual reproduction.

Question:3

Asexual method of reproduction by binary fission is common to which of the following?
i. Some eukaryotes
ii. All eukaryotes
iii. Some prokaryotes
iv. All prokaryotes
Choose the correct option from the following:
(a) i and ii; (b) ii and iii; (c) i and iii; (d) iii and iv.

Answer:

The answer is the option (c) (i) and (iii)
Explanation: Not all Prokaryotes reproduce by binary fission. Other Asexual reproduction methods like multiple fission and spore formation, are also seen in
prokaryotes. Eukaryotes reproduce through both asexual and sexual reproduction methods.

Question:4

A few statements with regard to sexual reproduction are given below:
i. Sexual reproduction does not always require two individuals
ii. Sexual reproduction generally involves gametic fusion
iii. Meiosis never occurs during sexual reproduction
iv. External fertilisation is a rule during sexual reproduction
Choose the correct statements from the options below:
(a) i and iv (b) i and ii (c) ii and iii (d)

Answer:

The answer is the option (b), (i) and (ii)

Explanation: Sexual reproduction does not always require two individuals as both the sexes are present on the same individual. In some of these cases, both the gametes from the same individual are involved.

Question:5

A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

a. haploid vegetative cells and diploid gametangia
b. diploid vegetative cells and diploid gametangia
c. diploid vegetative cells and haploid gametangia
d. haploid vegetative cells and haploid gametangia

Answer:

The answer is the option (d)
Explanation: Many Algae exhibit haplontic life cycle, where the dominant phase is free-living gametophyte. Sporophytic generation is represented by single-celled
zygote. Meiosis leads to the formation of haploid spores eg- Spirogyra and Chlamydomonas.

Question:6

The male gametes of rice plant have 12 chromosomes in their nucleus.The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively,
a. 12, 24, 12
b. 24, 12, 12
c. 12, 24, 24
d. 24, 12, 24.

Answer:

The answer is the option (c) 12, 24, 24
Explanation: Gametes have haploid number of chromosomes, whereas zygote and plants have diploid number of chromosomes.

Question:7

Given below are a few statements related to external fertilisation. Choose the correct statements.

i. The male and female gametes are formed and released simultaneously
ii. Only a few gametes are released into the medium
iii. Water is the medium in a majority of organisms exhibiting external fertilisation
iv. Offspring formed as a result of external fertilisation have a better chance of survival than those formed inside an organism

(a) iii and iv (b) i and iii (c) ii and iv (d) i and iv

Answer:

The answer is the option (b), (i) and (iii)
Explanation: Fertilisation requires both the gametes to be released simultaneously. A medium is needed by Male gametes to travel to the female gametes. Water is the medium in most cases. Air also acts as the medium in some cases.

Question:8

The statements given below describe certain features that are observed in the pistil of flowers.

i. A pistil may produce more than one seed
ii. Each carpel may have more than one ovule
iii. Each carpel has only one ovule
iv. The pistil has only one carpel

Choose the statements that are true from the options below:
(a) i and ii (b) i and iii (c) ii and iv (d) iii and iv

Answer:

The answer is the option (a), (i) and (ii)

Question:9

Which of the following situations correctly describe the similarity between an angiosperm egg and a human egg?

i. Eggs of both are formed only once in a lifetime
ii. Both the angiosperm egg and human egg are stationary
iii. Both the angiosperm egg and human egg are mobile
iv. Syngamy in both results in the formation of zygote

Choose the correct answer from the options given below:
(a) ii and iv (b) iv only (c) iii and iv (d) i and ii

Answer:

The answer is the option (b) iv only.
Explanation: Option (i) is incorrect as Eggs are formed several times during the lifetime in angiosperms. Option (ii) is incorrect as Human eggs travel from ovaries to the fallopian tube. Option (iii) is also incorrect as angiosperm eggs are stationary.

Question:10

The appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger are mainly because:
a. Nodes are shorter than internodes
b. Nodes have meristematic cells
c. Nodes are located near the soil
d. Nodes have non-photosynthetic cells

Answer:

The answer is the option (b) Nodes have meristematic cells
Explanation: Vegetative propagation requires meristematic cells

Question:11

Which of the following statements, support the view that an elaborate sexual reproductive process appeared much later in the organic evolution.
i. Lower groups of organisms have simpler body design
ii. Asexual reproduction is common in lower groups
iii. Asexual reproduction is common in higher groups of organisms
iv. The high incidence of sexual reproduction in angiosperms and vertebrates

Choose the correct answer from the options given below:
(a) i, ii and iii; (b) i, iii and iv (c) i, iii and iv (d) ii, iii and iv

Answer:

The answer is the option (c) (i), (ii) and (iv)
Explanation: Asexual reproduction is not common in higher groups of organisms.

Question:12

Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
a. Sexual reproduction is a lengthy process
b. Gametes of parents have qualitatively different genetic composition
c. Genetic material comes from parents of two different species
d. The greater amount of DNA is involved in sexual reproduction.

Answer:

The answer is the option (b) gametes of parents have a qualitatively different genetic composition
Explanation: During fertilisation, gene pools of two different individuals combine to form a zygote, which has a different genotype than both of its parents.

Question:13

Choose the correct statement from amongst the following:
a. Dioecious (hermaphrodite) organisms are seen only in animals
b. Dioecious organisms are seen only in plants
c. Dioecious organisms are seen in both plants and animals
d. Dioecious organisms are seen only invertebrates

Answer:

The answer is the option (c) Dioecious organisms are seen in both plants and animals
Explanation: Many flowering plants are dioecious. Ex – Pheretima

Question:14

There is no natural death in single-celled organisms like Amoeba and bacteria because:
a. They cannot reproduce sexually
b. They reproduce by binary fission
c. The parental body is distributed among the offspring
d. They are microscopic

Answer:

The answer is the option (c) Parental body is distributed among the offspring
Explanation: Single-celled organisms reproduce by binary fission. As the mother cell divides into 2 daughter cells, the mother cell does not die in the process.

Question:15

There are various types of reproduction. The type of reproduction adopted by an organism depends on:
a. The habitat and morphology of the organism
b. Morphology of the organism
c. Morphology and physiology of the organism
d. The organism’s habitat, physiology and genetic makeup

Answer:

The answer is the option (d) The organism’s habitat, physiology and genetic makeup
Explanation: The organism’s habitat, physiology and genetic makeup

Question:16

Identify the incorrect statement.
a. In asexual reproduction, the offspring produced are morphologically and genetically identical to the parent b. Zoospores are sexual reproductive structures
c. In asexual reproduction, a single parent produces offspring with or without the formation of gametes
d. Conidia are asexual structures in Penicillium

Answer:

The answer is the option (b) Zoospores are sexual reproductive structures
Explanation: Zoospores are sexual reproductive structures

Question:17

Which of the following is a post-fertilisation event in flowering plants?
a. Transfer of pollen grains
b. Embryo development
c. Formation of flower
d. Formation of pollen grains

Answer:

The answer is the option (b) Embryo development
Explanation: Reproduction Sequence in flowering plants is as shown:
Formation of flower → formation of pollen grains→transfer of pollen grains → fertilisation → embryo development

Question:18

The number of chromosomes in the shoot tip cells of a maise plant is 20.The number of chromosomes in the microspore mother cells of the same plant shall be:
a. 20
b. 10
c. 40
d. 15

Answer:

The answer is the option (a) 20
Explanation: microspore mother cells has same ploidy as the vegetative parts.

Very Short Answer Type Questions:

Question:1

Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.

Answer:

Amoeba and yeast can reproduce asexually due to the following reasons:
  1. They are unicellular organisms
  2. They have a simple organisation
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Question:2

Why do we refer to offspring formed by the asexual method of reproduction as clones?

Answer:

Asexual reproduction requires only a single parent and involves only the process of mitosis, which ensures that variation is not possible in offspring, and they are clones of their parents.

Question:3

Although potato tuber is an underground part, it is considered as a stem. Give two reasons.

Answer:

Potato Tuber is considered a stem due to the presence of the following features:
(a) Nodes (eyes)
(b) Scaly leaves

Question:4

Between an annual and a perennial plant, which one has a shorter juvenile phase? Give one reason.

Answer:

Annual plants have shorter juvenile phase compared to perennial plants. The number of flowering seasons in a year determines the length of the juvenile phase. While some perennial plants may produce flower only once in a year (some produce flowers once in 50 or even 100 years), annual plants have much shorter life cycles and thus, shorter juvenile phase.

Question:6

The probability of fruit set in a self-pollinated bisexual flower of a plant is far greater than a dioecious plant. Explain.

Answer:

Dioecious plants depend on agents of pollination to carry out sexual reproduction. The availability of agents is impacted significantly by external factors. Ex – Usage of high level of pesticides has reduced the population of pollinating insects. Hence, the probability of fruit set in self-pollinated bisexual flowers is far greater than a dioecious plant.

Question:7

Is the presence of a large number of chromosomes in an organism a hindrance to sexual reproduction? Justify your answer by giving suitable reasons.

Answer:

The number of chromosomes is not a deciding factor for the mode of reproduction.
Ex – Somatic cell of fruit fly only has 8 chromosomes, whereas somatic cell of a butterfly has 380 chromosomes, yet both of them reproduce sexually.

Question:8

Is there a relationship between the size of an organism and its life span? Give two examples in support of your answer.

Answer:

There is no relationship between the size of an organism and its life span. Ex – Though, mango and peepul tree have similar sizes; mango tree has a much shorter life span.

Question:9

In the figure given below the plant bears two different types of flowers marked ‘A’ and ‘B’. Identify the types of flowers and state the type of pollination that will occur in them.

Answer:

Chasmogamous flowers are shown in ‘A’ as they have exposed anther and stigma. Cross-pollination will be their mode of pollination.
They will require an agent of pollination.
Flowers shown in ‘B’ do not open. These are bisexual flowers and self-pollination will be their mode of pollination.

Question:10

Give reasons as to why cell division cannot be a type of reproduction in multicellular organisms.

Answer:

As multicellular organisms have a complex organisation; it isn’t possible for a single cell to produce all different types of tissues simply by undergoing mitosis.

Question:12

Why do gametes produced in large numbers in organisms exhibit external fertilisation?

Answer:

In external fertilisation, gametes are affected by their surroundings; they can get blown off by the wind, washed away by water, eaten by predators etc. and most of the gametes perish before fertilisation. A higher number of gametes increase the probability of fertilisation.

Question:13

Which of the followings are monoecious and dioecious organisms?
a. Earthworm ______________
b. Chara ______________
c. Marchantia ______________
d. Cockroach _____________

Answer:

(a) Dioecious
(b) Monoecious
(c) Dioecious
(d) Monoecious

Question:14

Match the organisms given in Column-’A’ with the vegetative propagules given in column ‘B’

Col. A
i. Bryophyllum
ii. Agave
iii. Potato
iv. Water hyacinth
Col. B
a) offset
b) eyes
c) leaf buds
d) bulbils

Answer:

i→(c)
ii→(d)
iii→(b)
iv→(a)

Question:15

What do the following parts of a flower develop into after fertilisation?
a. Ovary ______________
b. Ovules _____________

Answer:

(a) Fruits
(b) Seeds

Short Answer Type Questions:

Question:1

In haploid organisms that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

Answer:

In haploid organisms which reproduce by sexual reproduction, gametes are formed by meiotic division and the number of chromosomes is half of the total. The life cycle stage where meiosis occurs is known as the sporophytic generation and is represented by a single-celled zygote. In such plants, the gametophytic phase (haploid) is the dominant phase. Such a life cycle is called haplontic.
Ex – Volvox, Spirogyra, few species of Chlamydomonas.

Question:2

The number of taxa exhibiting asexual reproduction is drastically reduced in higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.

Answer:

Mitosis is involved in Asexual reproduction. Large organisms exhibit a complex organisation. In this scenario, it is not possible to produce all the different types of tissues required via the mitosis process.
This is the reason that asexual reproduction is seen abundantly in lower groups of plants and animals. However, it becomes rarer as the body complexity increases

Question:3

Honeybees produce their young ones only by sexual reproduction. Despite this, in a colony of bees, we find both haploid and diploid individuals. Name the haploid and diploid individuals in the colony and analyse the reasons behind their formation.

Answer:

Female and workers in a colony of bees are diploid, but male drones are haploid. This is because unfertilised eggs develop into male drones. This process is known as Parthenogenesis and is also shown by many plants. Ex- Banana

Question:4

With which type of reproduction do we associate the reduction division? Analyse the reasons for it.

Answer:

Reduction division is associated with sexual reproduction. Sexual reproduction involves fertilisation, which fuses two gametes to create the zygote. In this process zygote becomes diploid. To maintain the characteristics of a species, the gametes need to become haploid. This is achieved by reduction division.

Question:5

Is it possible to consider vegetative propagation observed in certain plants like Bryophyllum, water hyacinth, ginger, etc., as a type of asexual reproduction? Give two/three reasons.

Answer:

Vegetative propagation can be considered asexual reproduction as:
  1. Reproduction involves a single parent
  2. Meiosis does not occur
  3. Offspring gets DNA from a single parent

Question:6

‘Fertilisation is not an obligatory event for fruit production in certain plants’. Explain the statement.

Answer:

Parthenocarpic fruits like Banana are produced without fertilisation. It is also possible to artificially induce parthenocarpy in some plants like papaya and watermelon.
These fruits do not contain seeds as fertilisation is essential to the formation of seeds. However, it is possible for plants to produce fruits without undergoing fertilisation.

Question:7

In a developing embryo, analyse the consequences if cell divisions are not followed by cell differentiation.

Answer:

In a developing embryo, if cell divisions are not followed by cell differentiation, it won’t be possible for the various types of tissues to be created, rather a single mass of identical cells would be created. Cell differentiation is essential for the creation of organisms exhibiting complex organisation. This is similar to the differentiation of meristematic cells in plants. For vascular plants, differentiation makes it possible to form specialised tissues which can perform various functions.

Question:8

List the changes observed in an angiosperm flower after pollination and fertilisation.

Answer:

Post pollination and fertilisation, an angiosperm flower undergoes the following changes –
  1. Sepals, petals and stamens wither and fall off
  2. Zygote develops into embryo
  3. Ovule develops into the seed
  4. Ovary develops into the fruit
  5. Fruit develops pericarp, which is a thick outer covering

Question:9

Suggest a possible explanation of why the seeds in a pea pod are arranged in a row, whereas those in tomato are scattered in the juicy pulp.

Answer:

Unlike tomato’s pericarp, which is differentiated into epicarp, mesocarp and endocarp; pericarp in pea pod is not differentiated into many layers. The arrangement of seeds in a fruit is depended on placentation. Pea flower shows marginal placentation, while tomato shows axial placentation.

Question:10

Draw the sketches of a zoospore and a conidium. Mention two dissimilarities between them and at least one feature common to both structures.

Answer:

Similarities:
  1. Both are involved in asexual reproduction
  2. Both help an organism to tide over the bad phase
Differences:
Zoospores
Conidium
They are motile
They are non-motile
Flagella is present
Flagella is absent


Question:11

Justify the statement ‘Vegetative reproduction is also a type of asexual reproduction’.

Answer:

Vegetative reproduction is a type of asexual reproduction as:
  1. A single parent is involved
  2. Gametogenesis does not happen
  3. Reductive division doesn’t take place
  4. Offspring produced are clones of their parent

Long Answer Type Questions:

Question:1

Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.

Answer:

Asexual Reproduction
Sexual Reproduction
Single parent is required
Two parents are required
Gametogenesis doesn’t happen
Gametogenesis happens
Meiosis does not happen
Meiosis takes place during gametogenesis
Offspring’s genotype is identical to the parent
Offspring’s genotype is different from both parents.
Simple organisms reproduce asexually
Complex organisms reproduce sexually
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Types of Asexual reproduction:
  1. Binary fission: A unicellular organism divides into two daughter cells. Parent generation does not exist post binary fission. Ex - Amoeba
  2. Multiple fission: Nucleus of mother cell divides into daughter nuclei. A cyst develops around the mother cell, which ensures safety during unfavourable conditions. When favourable condition resumes, the cyst disintegrates, and daughter nuclei develop into new individuals. Ex – Plasmodium, Entamoeba
  3. Budding: Nucleus produces a daughter nucleus. This nucleus moves to a bud formed at one end of the cell. The bud then detaches from the mother cell to develop into a new individual. Ex – Yeast.

Question:2

Do all the gametes formed from a parent organism have the same genetic composition (identical DNA copies of the parental genome)?

Analyse the situation with the background of gametogenesis and provide or give a suitable explanation.

Answer:

Post meiosis, gamete formation takes place. Crossing overtakes place during the pachytene stage of Prophase I in meiosis. During crossing over, non-sister chromatids combine leading to recombination of various genes.
The daughter cells produced after meiosis; thus, have slightly different genotype compared to the mother cell. Variations in subsequent generations become possible because of crossing over. Minor variations over thousands of generations allow for evolution to take place.


Question:3

Although sexual reproduction is a long drawn, energy-intensive complex form of reproduction, many groups of organisms in Kingdom Animalia and Plantae prefer this mode of reproduction. Give at least three reasons for this.

Answer:

Sexual reproduction provides various survival benefits, and because of this, higher organisms in kingdom Animalia and Plantae prefer this mode of reproduction.Though asexual reproduction can generate a large number of offspring in a very short time span, these offspring are clones of their parent and have the same shortcomings as their parents. So, they will be equally susceptible to diseases and harsh surroundings. However, as sexual reproduction combines genotypes of a parent, over time, the later generations tend to have better genotype compared to the earlier generations.
Sexual reproduction also helps organisms to survive unfavourable conditions. Many plants utilise asexual reproduction during the favourable condition but resort to sexual reproduction in unfavourable conditions.
Organisms exhibiting asexual reproduction rely completely on the mutation to undergo evolution, however, in sexual reproduction each generation is slightly different from the previous one and these added over a few generations can also bring about evolution

Question:4

Differentiate between

(a) oestrus and menstrual cycles;

(b) ovipary and vivipary. Cite an example for each type.

Answer:

Oestrus cycle
Menstrual Cycle
Female becomes sexually active during the ovulation phase
Ovulation and sexual activity of female are independent of each other
In case of conception doesn’t take place, the endometrium is absorbed
In case of conception doesn’t take place, the endometrium is shed in fragments
Visible signs appear on female genitalia
Blood and tissue discharge happens from female genitalia
Ex – Cat, Dog, Horse
Ex – Humans, Chimpanzee, Monkey


Ovipary
Vivipary
The animal lays eggs
The animal gives birth to progeny
There is a lesser demand for resources from the female’s body
There is a greater demand for resources from the female’s body
Chances of survival of progeny are lower
Highly likely for the progeny to survive
Ex – reptiles and aves
Ex – Most mammals, shark etc


Question:5

Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand, a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for the failure of fruit formation in rose.
Both these plants – rose and tomato – both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. Roses, being vegetative propagated do not need to produce seeds.

Answer:

Human intervention is responsible for the production or absence of fruits in these plants. The specific purpose for each plant is important to understand the issue:
Rose plants are grown for ornamental purposes. Most varieties of rose also produce a nice fragrance. Rose is grown by vegetative propagation (asexual reproduction method), making seeds and fruit non-essential. Vegetative propagation is a faster process, and hence horticulturists around the world have adopted this technique for growing ornamental plants.
  • Petals in domestically grown varieties of Rose are tightly fit and may not allow pollination
  • Rose plant may not produce a functional egg
  • Rose plants may have abortive ovule
  • They may be self-incompatible
  • There may be internal barriers for pollen tube growth and/or fertilisation
Tomato is produced for its juicy fruit. This requires cultivators to follow a method which enables them to get as many fruits as possible.

Introduction of NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms:

Studying the chapter Reproduction in Organisms from NCERT exemplar Biology solutions chapter 1 for Class 12 will help students get a better understanding of the process of fertilization and the formation of new individuals alongside the 2 types of reproduction in organisms (i.e. plants and animals). In simpler terms, students would get to learn about the stages of life cycle in organisms along with how life continues. Apart from it being the basis of several other chapters in biology, this chapter is beneficial especially for students who wish to make their career in the fields of medical science and biotechnology.

Content includes

● Types of reproduction

● Fertilization and the formation of new individuals alongside pre-fertilization and post-fertilization events.

● Sexual reproduction asexual reproduction in detail

Major Subtopics in NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms

  • Asexual Reproduction
  • Sexual Reproduction
  • Pre fertilization events
  • Fertilization
  • Post fertilization events

NCERT Exemplar Class 12 Biology Solutions Chapter 1 Learning Outcome:

In NCERT Biology solutions chapter 1 exemplar Class 12 the students will learn about firstly, the types of reproduction. Secondly, reproduction process in different unicellular and multicellular organisms and lastly about the fertilization process (pre fertilization events and post fertilization events) easily in detail, all thanks to our teachers expertise.

NCERT Exemplar Class 12 Biology Chapter Wise:

Important Topics in NCERT Exemplar Class 12 Biology Solutions Chapter 1:

- Topics like, the reason why reproduction is essential for the continuity of species on earth and if the organisms do not reproduce, life will cease to exist alongside types of reproduction, are talked about in detail.

- Which type, whether sexual or asexual reproduction is better and why, is also talked about in detail in NCERT exemplar Class 12 Biology solutions chapter 1

- Furthermore, students will be able to comprehend between types, modes, and the process of reproduction in different organisms.

NCERT Exemplar Class 12 Solutions Subject wise:

Check NCERT solutions for questions given in the book:

Also, Read NCERT Solution subject wise

Must Read NCERT Notes subject wise

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Question (FAQs)

1. How can students download NCERT Exemplar Class 12 Biology solutions chapter 1 ?

Students can easily download the solutions in a PDF format from the solutions page itself by the given link for offline use.

2. What will the students learn from NCERT Exemplar Class 12 Biology solutions chapter 1?

Students will learn about types of reproduction, the process of fertilization and the formation of new individuals alongside the 2 types of reproduction in organisms (i.e. plants and animals). In simpler terms, students would get to learn about the stages of the life cycle in organisms along with how life continues and therefore the cycle of birth, growth, and death.

3. How will the students be able to benefit from NCERT exemplar Class 12 Biology solutions chapter 1?

Since,these solutions are prepared only by qualified persons and expert teachers, NCERT Exemplar Biology Solutions Chapter 1 for Class 12 would turn out to be very fruitful for the students.

  Students would be able to answer all major questions that were asked in previous question papers. Alongside questions from various textbooks, guides, important worksheets, MCQ’s and various other HOTS (Higher Order Thinking Skills) questions. The student will be fully prepared for the board exam.

4. How are the solutions prepared by the teachers?

Our Expert teachers use the chapters and given information alongside their practical knowledge and skills to solve the questions and prepare the solutions in a more detailed way.

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Questions related to CBSE Class 12th

Have a question related to CBSE Class 12th ?

hello mahima,

If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.

hope this helps.

Hello Akash,

If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.

You can get the Previous Year Questions (PYQs) on the official website of the respective board.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.

Hello student,

If you are planning to appear again for class 12th board exam with PCMB as a private candidate here is the right information you need:

  • No school admission needed! Register directly with CBSE. (But if you want to attend the school then you can take admission in any private school of your choice but it will be waste of money)
  • You have to appear for the 2025 12th board exams.
  • Registration for class 12th board exam starts around September 2024 (check CBSE website for exact dates).
  • Aim to register before late October to avoid extra fees.
  • Schools might not offer classes for private students, so focus on self-study or coaching.

Remember , these are tentative dates based on last year. Keep an eye on the CBSE website ( https://www.cbse.gov.in/ ) for the accurate and official announcement.

I hope this answer helps you. If you have more queries then feel free to share your questions with us, we will be happy to help you.

Good luck with your studies!

Hi there,

Yes you are obviously eligible to participate  in the jee mains and advance examination in 2025. Since it was your first attempt in the year 2024, you can certainly take a one year gap , that is a drop year and can give the exam in the next academic year.


For appearing in the exam in 2025, you only have to give a gap certificate to confirm your participation in the upcoming exam. You can further read more details regarding the gap year and the documents required to further participate in the examination.


Hope this resolves your query.

Hi there,

Hope you are doing fine

Yes you are certainly eligible for giving the jee exam in the year 2025. You must pass the maths exam with at least 75% criteria as required by jee and provide the marksheet and the passing certificate while registering for the exam.


Pursuing maths as an additional subject while taking biology as your main subject does not offer any hindrance in you appearing for the jee examination. It is indeed an privilege to pursue both maths and biology as the subjects and prepare for the same.

There will be no issue in filling the form while registering for the exam as it will only require your basic details and marksheet which you can provide by attaching the marksheet of maths also. Also, a detailed roadmap is also available on the official websites on how to fill the registration form. So you can fill the form easily.


Hope this resolves your query.

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