NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms
Upcoming Event
CBSE Class 12th Exam Date:01 Jan' 26 - 14 Feb' 26
The NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms is prepared to make students learn the fundamentals of how organisms reproduce, both sexually and asexually. The chapter explains asexual reproduction, where one parent produces identical offspring, and sexual reproduction, where two parents produce offspring with genetic differences. The NCERT Exemplar Solutions help students understand the concepts clearly by providing well-explained answers to different types of questions, which makes the exam preparation easier and more effective.
This Story also Contains
- NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms
- Discover NCERT Exemplar Class 12 Biology Chapter 1 (Multiple Choice Questions)
- Access NCERT Exemplar Class 12 Biology Chapter 1 Very Short Answer Type Questions
- Know the NCERT Exemplar Class 12 Biology Solutions Chapter 1 Short Answer Questions
- Get NCERT Exemplar Class 12 Biology Solutions Chapter 1 Long Answer Questions
- Approach to Solve Questions of Reproduction in Organisms Class 12 NCERT Exemplar
- Important topics of Reproduction in Organisms Class 12 NCERT Exemplar
- Advantages of NCERT Exemplar Class 12 Biology Chapter 1 Solutions
- Important Question from Reproduction in Organisms Class 12 NCERT Exemplar
- NCERT Exemplar Class 12 Biology Chapter Wise
The NCERT Exemplar Class 12 Solutions allow students to build a strong base in concepts through well-detailed and clear explanations. The chapter Reproduction in organisms also explains various modes of asexual reproduction, such as binary fission, budding, fragmentation, and parthenogenesis, and explains how sexual reproduction involves processes such as gamete formation, fertilisation, and post-fertilisation processes. These different forms of questions help students understand the chapter concepts more clearly and strengthen their preparation for both board and competitive exams.
NCERT Exemplar Class 12 Biology Solutions Chapter 1 Reproduction in Organisms
The solutions below include a variety of questions, such as multiple-choice questions, short-answer types, and long-answer types. With the regular practice of the NCERT Exemplar Class 12 Biology Solutions, students can improve their question-solving speed, accuracy, gain confidence, and perform better in their board and competitive exams such as NEET.
Discover NCERT Exemplar Class 12 Biology Chapter 1 (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 has some resemblance to 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.
Answer:
The answer is option (c) (ii) and (iv)Explanation: Gametic fusion and meiosis take place only in the 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 the parent and the offspring are completely different.
Answer:
The answer is option a) Offspring do not possess exact copies of parental DNAExplanation: Crossing Over takes place during meiosis and is responsible for some alteration in the 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
The 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 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 option (b), (i) and (ii)
Explanation: Sexual reproduction does not always require two individuals, as both sexes are present in 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 a 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 option (d)Explanation: Many Algae exhibit a haplontic life cycle, where the dominant phase is a free-living gametophyte. Sporophytic generation is represented by a single-celled zygote. Meiosis leads to the formation of haploid spores, eg, Spirogyra and Chlamydomonas.
Question:6
The male gametes of rice plants 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 option (c) 12, 24, 24Explanation: Gametes have a haploid number of chromosomes, whereas zygotes and plants have a 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 options (b), (i), and (iii)Explanation: Fertilisation requires both 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 option (a), (i), and (ii)Explanation: A pistil can produce multiple seeds because it may have multiple ovules, and each carpel may contain more than one ovule.
Question:9
Which of the following situations correctly describes 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 the human egg are stationary
iii. Both the angiosperm egg and the human egg are mobile
iv. Syngamy in both results in the formation of a 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 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 the ovaries to the fallopian tubes. 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 option (b). Nodes have meristematic cellsExplanation: Vegetative propagation requires meristematic cells because they actively divide and help in the formation of new shoots. In sugarcane and ginger, these cells at the nodes give rise to new plants.
Question:11
Which of the following statements supports the view that an elaborate sexual reproductive process appeared much later in the organic evolution?
i. Lower groups of organisms have a 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: Simpler organisms reproduce asexually, which is an earlier and easier form of reproduction, while complex sexual reproduction is seen in more evolved groups like angiosperms and vertebrates.
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 compositions
c. Genetic material comes from the parents of two different species
d. A greater amount of DNA is involved in sexual reproduction.
Answer:
The answer is option (b), the gametes of parents have a qualitatively different genetic compositionExplanation: 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 among 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 in invertebrates
Answer:
The answer is option (c). Dioecious organisms are seen in both plants and animalsExplanation: Dioecious organisms have separate male and female individuals. This is seen in plants like papaya and in animals like humans. It helps in cross-fertilization.
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 option (c) Parental body is distributed among the offspringExplanation: 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 option (d): The organism’s habitat, physiology, and genetic makeupExplanation: The reproductive method an organism uses is influenced by its surroundings (habitat), how its body functions (physiology), and its genetic traits. These factors together determine whether the organism reproduces sexually or asexually.
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 option (b) Zoospores are sexual reproductive structuresExplanation: Zoospores are actually asexual reproductive structures found in some algae and fungi; they are motile and formed without gamete fusion.
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 option (b) Embryo developmentExplanation: 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 maize 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 option (a) 20Explanation: Microspore mother cells are diploid (2n) just like other vegetative cells, such as those in the shoot tip. They undergo meiosis to form haploid microspores, but the mother cells themselves have the same chromosome number (20 in this case) as the rest of the diploid plant body.
Access NCERT Exemplar Class 12 Biology Chapter 1 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:- They are unicellular organisms
- They have a simple organisation
NEET Highest Scoring Chapters & Topics
Most Scoring concepts For NEET (Based On Previous Year Analysis)
Download EBookQuestion: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 the potato tuber is an underground part, it is considered 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 flowers only once a year (some produce flowers once in 50 or even 100 years), annual plants have much shorter life cycles and thus, shorter juvenile phases.Question:5
Answer:
Gametogenesis→ Pollination→ Fertilization→ EmbryogenesisQuestion:6
Answer:
Dioecious plants depend on agents of pollination to carry out sexual reproduction. The availability of agents is impacted significantly by external factors. Excessive usage of high levels of pesticides has reduced the population of pollinating insects. Hence, the probability of fruit set in self-pollinated bisexual flowers is far greater than in a dioecious plant.Question:7
Answer:
The number of chromosomes is not a deciding factor for the mode of reproduction.Ex – The somatic cell of a fruit fly only has 8 chromosomes, whereas the somatic cell of a butterfly has 380 chromosomes, yet both of them reproduce sexually.
Question:8
Answer:
There is no relationship between the size of an organism and its life span. Ex – Though mango and peepul trees have similar sizes, the mango tree has a much shorter life span.Question:9
Answer:
Chasmogamous flowers are shown in ‘A’ as they have an 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 increases the probability of fertilisation.Question:13
Which of the following 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
Know the NCERT Exemplar Class 12 Biology Solutions Chapter 1 Short Answer Questions
Question:1
Answer:
In haploid organisms that 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
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's complexity increases
Question:3
Answer:
Females 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- BananaQuestion: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
Answer:
Vegetative propagation can be considered asexual reproduction as:- Reproduction involves a single parent
- Meiosis does not occur
- An offspring gets DNA from a single parent
Question:6
Answer:
Parthenocarpic fruits like bananas 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
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 that 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 –- Sepals, petals, and stamens wither and fall off
- The zygote develops into an embryo
- The ovule develops into the seed
- The ovary develops into a fruit
- Fruit develops a pericarp, which is a thick outer covering
Question:9
Answer:
Unlike tomato’s pericarp, which is differentiated into epicarp, mesocarp, and endocarp, the pericarp in pea pod is not differentiated into many layers. The arrangement of seeds in a fruit depends on placentation. The pea flower shows marginal placentation, while the tomato shows axial placentation.Question:10
Answer:
Similarities:- Both are involved in asexual reproduction
- Both help an organism to tide over the bad phase
Zoospores | Conidium |
They are motile | They are non-motile |
Flagella are present | Flagella are absent |
 |  |
Question:11
Justify the statement ‘Vegetative reproduction is also a type of asexual reproduction’.
Answer:
Vegetative reproduction is a type of asexual reproduction.- A single parent is involved
- Gametogenesis does not happen
- Reductive division doesn’t take place
- Offspring produced are clones of their parent
CBSE Class 12th Syllabus: Subjects & Chapters
Select your preferred subject to view the chapters
Get NCERT Exemplar Class 12 Biology Solutions Chapter 1 Long Answer Questions
Question:1
Answer:
Asexual Reproduction | Sexual Reproduction |
A single parent is required | Two parents are required |
Gametogenesis doesn’t happen | Gametogenesis happens |
Meiosis does not happen | Meiosis takes place during gametogenesis |
The offspring’s genotype is identical to the parent's | The offspring’s genotype is different from both parents. |
Simple organisms reproduce asexually | Complex organisms reproduce sexually |
- Binary fission: A unicellular organism divides into two daughter cells. Parent generation does not exist post-binary fission. Ex - Amoeba
- Multiple fission: The Nucleus of the 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
- Budding: The 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
Analyse the situation with the background of gametogenesis and provide or give a suitable explanation.
Answer:
Post meiosis, gamete formation takes place. Crossing takes place during the pachytene stage of Prophase I in meiosis. During crossing over, non-sister chromatids combine, leading to the recombination of various genes.The daughter cells produced after meiosis, thus, have slightly different genotypes 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
Answer:
Sexual reproduction provides various survival benefits, and because of this, higher organisms in the kingdoms 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 the genotypes of a parent, over time, the later generations tend to have better genotypes compared to the earlier generations.Sexual reproduction also helps organisms to survive unfavourable conditions. Many plants utilise asexual reproduction during favourable conditions but resort to sexual reproduction in unfavourable conditions.
Organisms exhibiting asexual reproduction rely completely on 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
(a) oestrus and menstrual cycles;
(b) Ovipary and vivipary. Cite an example for each type.
Answer:
Oestrus cycle | Menstrual Cycle |
The female becomes sexually active during the ovulation phase | Ovulation and sexual activity of females 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 the female genitalia | Blood and tissue discharge happen from the 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 body | There is a greater demand for resources from the female body |
The chances of survival of progeny are lower | Highly likely that the progeny to survive |
Ex – reptiles and aves | Ex – Most mammals, sharks, etc |
Question:5
Answer:
Human intervention is responsible for the production or absence of fruits in these plants. The specific purpose of each plant is important to understand the issue:Rose plants are grown for ornamental purposes. Most varieties of roses also produce a nice fragrance. Rose is grown by vegetative propagation (an 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 roses are tightly fit and may not allow pollination
- A rose plant may not produce a functional egg
- Rose plants may have abortive ovules
- They may be self-incompatible
- There may be internal barriers to pollen tube growth and/or fertilization
NCERT Exemplar Class 12 Solutions Subject-wise:
Approach to Solve Questions of Reproduction in Organisms Class 12 NCERT Exemplar
This chapter is all about how different organisms reproduce. To answer questions well, students should understand the types, steps, and importance of reproduction in living beings.
Focus on differences and examples of asexual vs sexual reproduction, including budding, fragmentation, and gamete formation.
Understand the sequence of pre-fertilisation, fertilisation, and post-fertilisation events, and be able to identify them in examples.
Students have to practice Reproduction in Organisms Class 12 NCERT Exemplar to become comfortable with exam formats.
- Students are advised to prepare short notes and flowcharts for quick revision of key processes and terms.
- Solve previous years’ question papers to understand the types of questions asked and improve time management.
Also, read the NCERT Solution subject-wise
Important topics of Reproduction in Organisms Class 12 NCERT Exemplar
Reproduction in Organisms chapter is the basis for understanding how living organisms provide for the continuation of their species. The following is a table that outlines the most significant topics students need to concentrate on for examination and conceptual understanding.
Types of Reproduction
Asexual Reproduction – Methods and Examples
Sexual Reproduction – Stages and Significance
Pre-fertilisation Events – Gametogenesis and Gamete Transfer
Fertilisation – External and Internal
Post-fertilisation Events – Embryogenesis and Development
Life Span and Life Cycle of Organisms
Differences between Asexual and Sexual Reproduction
Significance of Reproduction in Organisms
Importance of Reproduction for Continuity of Life
Must Read NCERT Notes subject-wise
Advantages of NCERT Exemplar Class 12 Biology Chapter 1 Solutions
The chapter Reproduction in Organisms introduces students to the concept of how living beings reproduce through asexual and sexual ways. Solving exemplar problems offers many advantages to students, some of which are listed below:
- NCERT Exemplar Class 12 Biology Chapter 1 Solutions gives a clear understanding of the life spans, different modes of reproduction, and their examples.
- The exemplar solutions also give students the ability to answer application-based and conceptual questions correctly and confidently.
- Students can prepare for topics like vegetative propagation, spore formation, and pre-fertilization events, which are frequently asked in competitive exams like NEET.
- All the answers given in the exemplar problems are explained in a step-by-step manner, which makes it easier for students to understand the concepts.
Important Question from Reproduction in Organisms Class 12 NCERT Exemplar
Practicing the important questions in the chapter will help you gain knowledge in the important topics of the chapter well and prepare you well for the board exams as well as other entrance exams.
Question 1:
What is the period from birth to natural death of an organism known as?
a) Life span
b) Senescence
c) Age
d) Life cycle
Answer: The correct answer is option (a) Life span
Explanation:
The period from birth to natural death of an organism is called its life span. Life span varies greatly among different organisms, ranging from a few days (as in some insects) to several thousand years (as in certain trees). It is a fundamental biological concept that helps distinguish between different life forms and is not to be confused with age (which refers to how long an individual has lived) or life cycle (which describes the sequence of stages in an organism's development)
Also, check the NCERT Books and the NCERT Syllabus here
NCERT Exemplar Class 12 Biology Chapter Wise
Find all chapter-wise practice questions and solutions in the table below to strengthen your concepts and prepare effectively for exams.
Frequently Asked Questions (FAQs)
Q: What are the main differences between asexual and sexual reproduction?
A:
Asexual reproduction involves a single parent and produces offspring that are genetically and morphologically identical to the parent (clones), while sexual reproduction involves the fusion of male and female gametes from one or two parents, resulting in genetically diverse offspring.
Q: Why can't the term 'clone' be applied to offspring formed by sexual reproduction?
A:
The term 'clone' is not used for sexually produced offspring because they do not possess exact copies of parental DNA; instead, they inherit a mix of genetic material from both parents, resulting in genetic variation.
Q: What are pre-fertilization, fertilization, and post-fertilization events in sexual reproduction?
Q: Why is asexual reproduction less common in higher plants and animals?
A:
Asexual reproduction is less frequent in higher plants (angiosperms) and animals (vertebrates) because these groups have evolved complex reproductive structures and life cycles that favour genetic diversity through sexual reproduction.
Q: What types of questions are included in the NCERT Exemplar for this chapter, and how do they help?
A:
The Exemplar includes MCQs, very short, short, and long answer questions covering concepts like types of reproduction, events in sexual reproduction, and differences between reproductive strategies. Practising these questions enhances conceptual clarity and exam preparedness.
Q: What are the common examples of asexual reproduction in plants and animals?
A:
Asexual reproduction in plants and animals involves creating offspring from a single parent without the fusion of gametes, examples include budding (Hydra), fragmentation (Planaria), and vegetative propagation (onion) in plants, and fission (amoeba), budding (hydra), and fragmentation (sea stars) in animals.
Q: What are the advantages and disadvantages of sexual reproduction?
A:
Sexual reproduction, while leading to increased genetic diversity and adaptation, is a slower, more energy-intensive process than asexual reproduction, requiring two parents and potentially diluting advantageous traits.
Q: What is the role of gametes in sexual reproduction according to NCERT Exemplar?
A:
According to NCERT Exemplar, in sexual reproduction, gametes, which are haploid reproductive cells (sperm and egg), fuse during fertilization to form a diploid zygote, initiating the development of a new organism.
Articles
Related Stories
|
Upcoming School Exams
Certifications By Top Providers
Explore Top Universities Across Globe
Questions related to CBSE Class 12th
On Question asked by student community
Have a question related to CBSE Class 12th ?
Hello,
You can get the Class 11 English Syllabus 2025-26 from the Careers360 website. This resource also provides details about exam dates, previous year papers, exam paper analysis, exam patterns, preparation tips and many more. you search in this site or you can ask question we will provide you the direct link to your query.
LINK: https://school.careers360.com/boards/cbse/cbse-class-11-english-syllabus
Hello,
No, it’s not true that GSEB (Gujarat Board) students get first preference in college admissions.
Your daughter can continue with CBSE, as all recognized boards CBSE, ICSE, and State Boards (like GSEB) which are equally accepted for college admissions across India.
However, state quota seats in Gujarat colleges (like medical or engineering) may give slight preference to GSEB students for state-level counselling, not for all courses.
So, keep her in CBSE unless she plans to apply only under Gujarat state quota. For national-level exams like JEE or NEET, CBSE is equally valid and widely preferred.
Hope it helps.
Hello,
The Central Board of Secondary Education (CBSE) releases the previous year's question papers for Class 12.
You can download these CBSE Class 12 previous year question papers from this link : CBSE Class 12 previous year question papers (http://CBSE%20Class%2012%20previous%20year%20question%20papers)
Hope it helps !
Hi dear candidate,
On our official website, you can download the class 12th practice question paper for all the commerce subjects (accountancy, economics, business studies and English) in PDF format with solutions as well.
Kindly refer to the link attached below to download:
CBSE Class 12 Accountancy Question Paper 2025
CBSE Class 12 Economics Sample Paper 2025-26 Out! Download 12th Economics SQP and MS PDF
CBSE Class 12 Business Studies Question Paper 2025
CBSE Class 12 English Sample Papers 2025-26 Out – Download PDF, Marking Scheme
BEST REGARDS
Hello,
Since you have passed 10th and 12th from Delhi and your residency is Delhi, but your domicile is UP, here’s how NEET counselling works:
1. Counselling Eligibility: For UP NEET counselling, your UP domicile makes you eligible, regardless of where your schooling was. You can participate in UP state counselling according to your NEET rank.
2. Delhi Counselling: For Delhi state quota, usually 10th/12th + residency matters. Since your school and residency are in Delhi, you might also be eligible for Delhi state quota, but it depends on specific state rules.
So, having a Delhi Aadhaar will not automatically reject you in UP counselling as long as you have a UP domicile certificate.
Hope you understand.
Popular CBSE Class 12th Questions
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)
|
Option 2)
|
| Option 3)
|
Option 4)
|
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)
|
Option 2)
|
| Option 3)
|
Option 4)
|
A particle is projected at 600 to the horizontal with a kinetic energy . The kinetic energy at the highest point
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
In the reaction,
| Option 1)
|
Option 2)
|
| Option 3)
|
Option 4)
|
How many moles of magnesium phosphate, 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 |
Colleges After 12th
Applications for Admissions are open.
This ebook serves as a valuable study guide for NEET 2025 exam.
NEET Previous 10 Year Questions
Get nowThis e-book offers NEET PYQ and serves as an indispensable NEET study material.
JEE Main Important Physics formulas
Get nowAs per latest syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
JEE Main Important Chemistry formulas
Get nowAs per latest syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
JEE Main high scoring chapters and topics
Get nowAs per latest 2024 syllabus. Study 40% syllabus and score upto 100% marks in JEE
JEE Main Important Mathematics Formulas
Get nowAs per latest syllabus. Maths formulas, equations, & theorems of class 11 & 12th chapters
CBSE Class 12th Notifications
Never miss an CBSE Class 12th update
Get timely CBSE Class 12th updates directly to your inbox. Stay informed!