CBSE Class 8 Science Exemplar: Reproduction in Animals NCERT Solutions

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NCERT Solutions PDF Class 8 PDF

This chapter delves into the fascinating process of reproduction in animals, a fundamental concept in Class 8 Science. The NCERT Solutions for Chapter 9, "Reproduction in Animals," provide clear explanations and step-by-step solutions to various questions. Key topics covered include the differences between internal and external fertilization, the roles of different reproductive organs, the distinction between oviparous and viviparous animals, and asexual reproduction methods like budding. These solutions are designed to help students grasp the intricacies of how animals reproduce, understand the life cycles, and prepare effectively for their examinations by reinforcing their knowledge of these biological processes.

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Quick info

BoardCBSE
ClassClass 8
SubjectScience Exemplar
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 9

Chapter summary

Chapter 9 of the Class 8 Science Exemplar focuses on Reproduction in Animals. The NCERT Solutions cover multiple-choice questions and explanations related to fertilization (internal vs. external), the development of the embryo, the characteristics of oviparous and viviparous animals, and asexual reproduction methods such as budding. The solutions aim to clarify these concepts for students, ensuring a solid understanding of animal reproduction.

Learning outcomes

  • Understand the process of reproduction in animals.
  • Differentiate between internal and external fertilization.
  • Identify oviparous and viviparous animals.
  • Explain the process of budding in organisms like Hydra.
  • Recognize the roles of different reproductive organs in humans.

Topics covered

Paper topics

  • Reproduction in Animals
  • Fertilization (Internal and External)
  • Oviparous Animals
  • Viviparous Animals
  • Embryo Development
  • Reproductive Organs in Humans
  • Asexual Reproduction (Budding)
  • Comparison of Reproductive Methods

Important topics

  • Internal vs. External Fertilization
  • Oviparous and Viviparous Animals
  • Human Reproductive Process
  • Budding in Hydra

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Questions and Solutions

Question 1

Sets of reproductive terms are given below. Choose the set that has an incorrect combination.
  1. sperm, testis, sperm duct, penis
  2. menstruation, egg, oviduct, uterus
  3. sperm, oviduct, egg, uterus
  4. ovulation, egg, oviduct, uterus
Solution: The incorrect combination is (c) sperm, oviduct, egg, uterus. Here's why: Sperm is the male gamete produced in the testes. The oviduct and uterus are parts of the female reproductive system. While the egg (female gamete) is found in the oviduct and uterus, sperm does not typically travel through the oviduct and uterus as part of its initial journey; fertilization occurs when sperm meets the egg, usually in the oviduct. Options (a), (b), and (d) represent correct associations of reproductive terms.

Question 2

In humans, the development of the fertilised egg takes place in the
  1. ovary
  2. testis
  3. oviduct
  4. uterus
Solution: The correct answer is (d) uterus. After fertilization occurs, typically in the oviduct, the resulting zygote undergoes cell division and travels to the uterus. It then implants itself into the uterine wall, where it continues to develop into an embryo and eventually a fetus throughout the pregnancy.

Question 3

In the list of animals given below, hen is the odd one out. Human being, cow, dog, hen. The reason for this is
  1. it undergoes internal fertilisation.
  2. it is oviparous.
  3. it is viviparous.
  4. it undergoes external fertilisation.
Solution: The correct answer is (b) it is oviparous. Hens are oviparous, meaning they lay eggs, and the young hatch from these eggs. Human beings, cows, and dogs are viviparous animals; they give birth to live young ones after the development of the embryo inside the mother's body. Therefore, the hen is the odd one out because of its mode of reproduction.

Question 4

Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following.
  1. The animals are small in size and want to produce more offsprings.
  2. Food is available in plenty in water.
  3. To ensure better chance of fertilisation.
  4. Water promotes production of large number of gametes.
Solution: The most appropriate reason is (c) To ensure better chance of fertilisation. In external fertilization, gametes are released into the aquatic environment. These gametes are subject to various environmental factors like water currents, wind, and rain, which can disperse them widely. Producing a large number of gametes significantly increases the probability that some of them will successfully meet and fuse, leading to fertilization.

Question 5

Reproduction by budding takes place in
  1. hydra
  2. amoeba
  3. paramecium
  4. bacteria
Solution: The correct answer is (a) hydra. Hydra reproduces asexually through a process called budding. A small outgrowth, or bud, forms on the parent hydra's body. This bud grows and develops into a new, smaller hydra, which eventually detaches from the parent and lives independently. Amoeba, paramecium, and bacteria typically reproduce through binary fission, a different method of asexual reproduction.

Question 6

Which of the following statements about reproduction in humans is correct?
  1. Fertilisation takes place externally.
  2. Fertilisation takes place in the testes.
  3. During fertilisation egg moves towards the sperm.
  4. Fertilisation takes place in the human female.
Solution: The correct statement is (d) Fertilisation takes place in the human female. In humans, fertilization is an internal process, meaning it occurs within the female reproductive tract, specifically in the oviduct (fallopian tube). The egg is released from the ovary and travels to the oviduct, where it can be met and fertilized by sperm. Option (a) is incorrect because human fertilization is internal. Option (b) is incorrect as testes are male reproductive organs where sperm are produced, not where fertilization occurs. Option (c) is incorrect; while sperm move towards the egg, the egg itself does not actively move towards the sperm in a way that defines the fertilization process.

Common mistakes

  • Confusing internal and external fertilization.
  • Incorrectly classifying animals as oviparous or viviparous.
  • Misidentifying the site of fertilization or embryo development in humans.
  • Confusing asexual reproduction methods like budding with binary fission.

Revision tips

  • Focus on understanding the key differences between oviparous and viviparous reproduction.
  • Draw diagrams to visualize the reproductive systems and processes.
  • Practice identifying the correct set of reproductive terms for different scenarios.
  • Review the explanations for each question to reinforce conceptual understanding.

Practice MCQs

Q1. Which set of reproductive terms contains an incorrect combination?

Q2. In humans, where does the development of the fertilised egg primarily occur?

Q3. Hen is an odd one out among human beings, cow, dog, and hen. What is the reason?

Q4. Animals that exhibit external fertilization often produce a large number of gametes. Why?

Q5. Reproduction by budding is a characteristic method in which of the following organisms?

Q6. Which statement about reproduction in humans is correct?

Frequently asked questions

What is the main topic of CBSE Class 8 Science Exemplar Chapter 9?

Chapter 9 focuses on Reproduction in Animals, covering various methods of reproduction, fertilization, and the development of young ones in different animal species.

What is the difference between oviparous and viviparous animals?

Oviparous animals lay eggs (like hens), while viviparous animals give birth to live young ones (like humans and cows).

Where does fertilization occur in humans?

Fertilization in humans is internal and typically occurs in the oviduct (fallopian tube) of the female reproductive system.

How does Hydra reproduce?

Hydra reproduces asexually through budding, where a new individual grows from an outgrowth on the parent's body.

Why do animals with external fertilization produce many gametes?

They produce numerous gametes to increase the chances of fertilization, as gametes released into the environment face risks of being washed away or not meeting.

Important links

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NCERT Solutions PDF PDF on NCERT Help. URL unchanged for search indexing.