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CBSE Class 8 Science Chapter 6 Reproduction in Animals Worksheet with Answers

Reproduction in Animals is a fundamental chapter in CBSE Class 8 Science that explores how different animal species produce offspring through sexual and asexual modes. This printable worksheet has been carefully designed to assess understanding of key topics such as types of reproduction, fertilisation (external and internal), embryonic development, viviparous and oviparous animals, and metamorphosis. Students should attempt this worksheet in 60 minutes to simulate exam conditions and then check answers for thorough self-assessment.

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Key takeaways

  • ✓Printable worksheet covering all NCERT topics: sexual and asexual reproduction, fertilisation, and metamorphosis in animals
  • ✓35+ questions across five sections ranging from basic MCQs to HOTS questions suitable for both revision and exam preparation
  • ✓Difficulty level: Moderate; Suggested time: 60 minutes for attempting all questions under exam conditions
  • ✓Complete answer key with explanations provided at the end to enable self-assessment and conceptual clarity
  • ✓Aligned with CBSE Class 8 Science syllabus 2025 and follows NCERT terminology and question patterns
  • ✓Includes one case-study question to help students practice new CBSE competency-based assessment formats
  • ✓Ideal for worksheet practice at home, school assignments, or quick revision before periodic tests

Quick Chapter Recap: Reproduction in Animals

Before you begin the worksheet, quickly revisit the core concepts from NCERT Class 8 Science Chapter 6. Reproduction is the biological process by which organisms produce new individuals of the same species. Animals reproduce through two primary modes: sexual reproduction (involving two parents and the fusion of male and female gametes) and asexual reproduction (involving a single parent, without gamete fusion). Sexual reproduction involves fertilisation, which can be external (outside the body, as in frogs and fish) or internal (inside the body, as in humans, cows, and birds). After fertilisation, the zygote develops into an embryo. Some animals lay eggs (oviparous) while others give birth to young ones (viviparous). Metamorphosis is the transformation that some animals undergo from larva to adult form, seen dramatically in frogs, butterflies, and silkworms. Understanding these distinctions is crucial for answering the worksheet questions accurately.
  • Sexual reproduction: Involves male and female gametes; fusion forms zygote
  • Asexual reproduction: Single parent; methods include budding (Hydra), binary fission (Amoeba), fragmentation (Planaria)
  • Fertilisation: External (frog, fish) vs Internal (humans, birds, reptiles)
  • Oviparous: Egg-laying animals (hens, frogs, butterflies); Viviparous: Give birth to live young (humans, cats, dogs)
  • Metamorphosis: Larva → Pupa → Adult (complete); Tadpole → Froglet → Adult frog (incomplete)

Section A: Multiple Choice Questions (MCQs)

This section contains six multiple-choice questions testing your recall and understanding of the basic concepts from Chapter 6 Reproduction in Animals. Each question has four options; choose the most appropriate answer. MCQs often appear in CBSE periodic tests and are excellent for quick revision. Read each question carefully, eliminate obviously wrong options, and select the best answer. These questions cover sexual and asexual reproduction, types of fertilisation, viviparous and oviparous animals, cloning, and metamorphosis as described in the NCERT textbook. Remember to check your answers against the answer key provided at the end of this worksheet to identify any gaps in your understanding of Class 8 Science Chapter 6 concepts. Each correct answer carries one mark.
  • Q1. The process of fusion of male and female gametes is called: (a) Reproduction (b) Fertilisation (c) Metamorphosis (d) Budding
  • Q2. Which of the following animals exhibits external fertilisation? (a) Hen (b) Cow (c) Frog (d) Human
  • Q3. Budding is a method of asexual reproduction observed in: (a) Amoeba (b) Hydra (c) Planaria (d) Butterfly
  • Q4. Animals that lay eggs are called: (a) Viviparous (b) Oviparous (c) Ovoviviparous (d) Metamorphic
  • Q5. The production of Dolly the sheep is an example of: (a) External fertilisation (b) Internal fertilisation (c) Cloning (d) Metamorphosis
  • Q6. Which of the following animals undergo complete metamorphosis? (a) Frog (b) Cockroach (c) Butterfly (d) Grasshopper

Section B: Fill in the Blanks

Complete each sentence by filling in the blank with the correct term from Chapter 6 Reproduction in Animals. This section tests your ability to recall precise terminology and definitions used in NCERT Class 8 Science. Pay attention to spelling and use the exact scientific terms discussed in the textbook. Fill-in-the-blank questions require you to remember key facts about reproductive modes, types of fertilisation, developmental stages, and specific examples of animals mentioned in the chapter. Take care with terms like zygote, embryo, foetus, metamorphosis, binary fission, budding, fragmentation, internal fertilisation, external fertilisation, oviparous, and viviparous. These questions are commonly asked in CBSE school exams and help reinforce conceptual vocabulary. Each blank carries one mark, so ensure accuracy in terminology and spelling for full credit in your assessments.
  • Q7. The fertilised egg is called a _________.
  • Q8. In _________ fertilisation, the fusion of gametes occurs inside the female body.
  • Q9. The transformation of a larva into an adult through drastic changes is called _________.
  • Q10. Amoeba reproduces by the method of _________.
  • Q11. Animals like dogs and cats which give birth to young ones are called _________ animals.
  • Q12. The developing embryo in humans is called a _________ after eight weeks of pregnancy.
  • Q13. The type of asexual reproduction seen in Planaria is called _________.

Section C: True or False Statements

Evaluate each statement carefully and write True or False. If a statement is false, provide the correct version in your answer sheet. This exercise sharpens your ability to distinguish between correct and incorrect biological facts related to Reproduction in Animals. The statements in this section are based on NCERT Class 8 Science content and test your understanding of fundamental concepts such as the difference between sexual and asexual reproduction, characteristics of internal and external fertilisation, examples of oviparous and viviparous animals, the process of metamorphosis, and specific reproductive strategies in different animal groups. Always justify false statements by writing the corrected statement; this practice deepens conceptual understanding and is valued in CBSE marking schemes. Read each statement twice before deciding, as small details can change the meaning completely. Each correct identification carries half a mark, and the correction carries an additional half mark.
  • Q14. Binary fission is a mode of sexual reproduction.
  • Q15. Frogs exhibit internal fertilisation.
  • Q16. Hens are viviparous animals.
  • Q17. A tadpole undergoes metamorphosis to become an adult frog.
  • Q18. Cloning involves the fusion of male and female gametes.
  • Q19. The zygote divides repeatedly to form an embryo.
  • Q20. Budding is observed in Amoeba.

Section D: Short Answer Questions (2-3 marks each)

Answer the following questions in two to three sentences each. These short-answer questions require you to explain concepts clearly and concisely, using correct scientific terminology from Chapter 6 Reproduction in Animals. Aim for about 30-40 words per answer. Good short answers define the term or concept, provide a relevant example if asked, and use precise language from the NCERT textbook. Marks are awarded for accurate definitions, appropriate examples, and clear explanations. Practice writing short answers within the word limit, as this skill is essential for scoring well in CBSE Class 8 Science exams. Short-answer questions typically carry 2 to 3 marks each and can cover any topic from the chapter: modes of reproduction, fertilisation types, examples of animals, developmental stages, metamorphosis, or reproductive structures. Revise your NCERT Class 8 Science notes thoroughly before attempting these questions. Always underline or highlight keywords such as sexual reproduction, asexual reproduction, zygote, embryo, fertilisation, internal, external, oviparous, viviparous, metamorphosis, budding, binary fission, and fragmentation.
  • Q21. Differentiate between internal fertilisation and external fertilisation with one example each.
  • Q22. What is budding? Name one organism that reproduces by budding.
  • Q23. Define metamorphosis. Give one example of an animal that undergoes metamorphosis.
  • Q24. What is the difference between oviparous and viviparous animals? Give one example of each.
  • Q25. Explain the term 'zygote' and describe what happens to it after fertilisation.

Section E: Long Answer and HOTS Questions (5 marks each)

This section contains three long-answer or Higher Order Thinking Skills questions that require detailed explanations, diagrams where specified, and application of concepts learned in Chapter 6 Reproduction in Animals. Each answer should be around 80-100 words or roughly six to eight well-structured sentences. Long-answer questions test your depth of understanding and your ability to connect multiple concepts, compare and contrast different processes, explain sequences of events, and apply knowledge to new situations. Use appropriate headings, bullet points, and labelled diagrams to organise your answer and make it easy for the examiner to award marks. In CBSE Class 8 Science exams, five-mark questions often ask you to describe a process step-by-step (like the life cycle of a frog), compare two modes of reproduction, or explain the significance of a biological process with examples. Always conclude with a summary sentence. Revise diagrams from your NCERT Class 8 Science textbook, especially those showing the life cycle of a frog, butterfly metamorphosis, and binary fission in Amoeba, as these are commonly asked in exams. HOTS questions encourage you to analyse, evaluate, and create rather than just recall facts.
  • Q26. Describe the life cycle of a frog with the help of a labelled diagram. (5 marks)
  • Q27. Explain sexual reproduction in animals. Why is it considered advantageous over asexual reproduction? Give three reasons. (5 marks)
  • Q28. What is cloning? Describe the process briefly with reference to Dolly the sheep. Discuss one advantage and one disadvantage of cloning technology. (5 marks)

Section F: Case Study Question (4 marks)

Read the case study carefully and answer the sub-questions that follow. Case-study questions are part of the competency-based assessment pattern introduced by CBSE in recent years and test your ability to analyse information, apply concepts, and draw conclusions. These questions integrate knowledge from the chapter with real-world observations or experimental data. Take your time to read the passage twice, underline key facts, and then answer each sub-question precisely. Marks are distributed across recall, understanding, and application levels. The case study below is based on the life cycle and metamorphosis of the frog, which is a central example in NCERT Class 8 Science Chapter 6 Reproduction in Animals. The case study format is becoming increasingly common in CBSE exams, so practicing such questions will give you an edge in periodic tests and annual examinations. Write your answers clearly and refer to specific details from the case study passage to support your answers. This question carries a total of four marks distributed among sub-questions.

Answer Key with Explanations

Below is the complete answer key for all sections of this CBSE Class 8 Science Chapter 6 Reproduction in Animals worksheet. Use this key to check your answers after you have attempted all questions honestly under timed conditions. For MCQs and fill-in-the-blanks, the correct answer is provided. For descriptive answers (short and long), model answers or key points are given. Carefully compare your responses with these answers, award yourself marks objectively, and make notes of any mistakes or knowledge gaps. Pay special attention to the explanations provided for each answer, as understanding why an answer is correct or incorrect strengthens conceptual clarity and prepares you for similar questions in school exams. If you scored below seventy percent, revise the chapter again using your NCERT Class 8 Science textbook and class notes. Students aiming for above ninety percent should focus on long-answer structuring and HOTS questions. For personalized doubt-clearing and chapter-wise practice with instant AI feedback, consider using CBSETUTOR.ai, which offers 24×7 tutoring support with photo-upload problem solving at just ₹999 per month for all classes 6-12, with a three-day free trial to get started. Regular worksheet practice combined with smart digital tools can significantly improve exam performance and confidence.

Section A Answers: MCQs

Here are the correct answers to all six multiple-choice questions from Section A along with brief explanations to help you understand the reasoning. Each MCQ tests a specific concept from NCERT Class 8 Science Chapter 6 Reproduction in Animals. If you made any mistakes, revisit the relevant section in your textbook and make short notes for quick revision. Understanding the rationale behind each correct option will help you tackle similar questions confidently in your school exams and CBSE assessments.
  • A1. (b) Fertilisation — Fertilisation is defined as the fusion of male gamete (sperm) and female gamete (ovum) to form a zygote.
  • A2. (c) Frog — Frogs release eggs and sperm into water where fertilisation occurs externally. Hen, cow, and humans have internal fertilisation.
  • A3. (b) Hydra — Hydra reproduces asexually by budding; a small outgrowth (bud) develops and detaches to form a new individual. Amoeba uses binary fission, Planaria uses fragmentation.
  • A4. (b) Oviparous — Oviparous animals lay eggs (e.g. hen, frog, butterfly). Viviparous animals give birth to live young (e.g. humans, dogs).
  • A5. (c) Cloning — Dolly the sheep was produced by cloning, which involves creating a genetically identical copy without fertilisation.
  • A6. (c) Butterfly — Butterflies undergo complete metamorphosis with four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult. Frogs have incomplete metamorphosis.

Section B, C, D, E and F Answers

This section provides answers to fill-in-the-blanks, true-false, short-answer, long-answer, and case-study questions. Review your answers carefully against these model responses. For short and long answers, the key points are provided; your phrasing may differ slightly but should cover the main ideas. Award yourself marks based on content accuracy, use of scientific terms, and completeness of explanation. If your answers are significantly different, reread the relevant portions of Chapter 6 in your NCERT Class 8 Science textbook and try rewriting the answers from memory to reinforce learning. Consistent practice with worksheets and answer keys is one of the most effective strategies for CBSE exam preparation. Note any recurring mistakes and create a separate error log to avoid repeating them in actual exams. For difficult concepts like metamorphosis or the process of cloning, consider drawing labelled diagrams and flowcharts as visual aids. These techniques not only improve retention but also help in scoring full marks in diagram-based questions that frequently appear in CBSE Science papers.
  • A7. zygote
  • A8. internal
  • A9. metamorphosis
  • A10. binary fission
  • A11. viviparous
  • A12. foetus
  • A13. fragmentation
  • A14. False. Binary fission is a mode of asexual reproduction, not sexual.
  • A15. False. Frogs exhibit external fertilisation in water.
  • A16. False. Hens are oviparous animals (lay eggs).
  • A17. True.
  • A18. False. Cloning does not involve gamete fusion; it produces a genetic copy from a single parent.
  • A19. True.
  • A20. False. Budding is observed in Hydra, not Amoeba (which reproduces by binary fission).

Long Answer Key and Case Study Answers

Model answers for the three long-answer questions and the case-study question are provided here. Long answers should be well-structured with an introduction, main body covering all key points, and a brief conclusion. Use diagrams wherever asked, labelling them neatly. For the life cycle of the frog, your diagram should show: eggs in water, tadpole with gills and tail, tadpole with developing legs, young frog with reduced tail, and adult frog. Each stage should be clearly labelled. When comparing advantages of sexual reproduction, explain genetic variation, adaptability, and evolutionary benefits. In the cloning answer, describe the Dolly experiment briefly: nucleus from an udder cell was inserted into an egg cell whose nucleus had been removed, the egg developed into an embryo and was implanted in a surrogate mother, resulting in Dolly. Advantage: can produce genetically identical animals with desired traits. Disadvantage: ethical concerns and reduced genetic diversity. The case-study answers must be direct and refer to information in the passage. This worksheet structure helps students prepare for all question formats in CBSE Class 8 Science examinations.
  • A26. The frog life cycle involves these stages: (i) Eggs are laid in water and fertilised externally. (ii) Zygote develops into a tadpole with gills and tail. (iii) Tadpole grows and develops lungs and legs. (iv) Tail gradually shortens. (v) Young frog emerges, capable of living on land. (vi) Grows into adult frog. [Diagram should show all these labelled stages in a cycle.]
  • A27. Sexual reproduction involves fusion of male and female gametes from two different parents, resulting in a zygote. Advantages: (1) Produces genetic variation due to combination of genes from two parents, leading to diversity. (2) Variations help species adapt to changing environments and survive. (3) Harmful mutations can be eliminated through genetic recombination. Though slower and energy-intensive, sexual reproduction is vital for evolution and long-term species survival.
  • A28. Cloning is the production of genetically identical individuals from a single parent without fertilisation. Dolly the sheep was cloned in 1996 by transferring the nucleus of an udder cell into an egg cell whose nucleus was removed; the embryo was implanted in a surrogate. Advantage: Produces organisms with desired traits, useful in medicine and agriculture. Disadvantage: Reduces genetic diversity and raises ethical issues about applying the technique to humans.
  • A29. (i) External fertilisation. (ii) Frogs lay hundreds of eggs because many eggs and tadpoles are eaten by predators; large numbers ensure some survive to adulthood. (iii) Tadpole: gills; Adult frog: lungs (and skin). (iv) Metamorphosis is the transformation of a larva (tadpole) into an adult (frog) through drastic changes in body structure, including development of limbs, lungs, and resorption of the tail.

Frequently asked questions

What topics from NCERT Class 8 Science Chapter 6 are covered in this worksheet?+
This worksheet covers all major topics: sexual and asexual reproduction (budding, binary fission, fragmentation), internal and external fertilisation, oviparous and viviparous animals, development of embryo and foetus, metamorphosis in frogs and insects, and cloning. It is fully aligned with the CBSE syllabus.
How much time should my child take to complete this worksheet?+
Students should attempt this worksheet in approximately 60 minutes under exam-like conditions. This includes time for reading, thinking, and writing answers. After completing, allow another 15-20 minutes to check answers against the provided answer key for self-assessment and learning.
Is the answer key detailed enough for self-study?+
Yes, the answer key includes correct answers for all MCQs, fill-in-the-blanks, and true-false questions. For short and long answers, model responses with key points and explanations are provided so students can compare their answers, understand mistakes, and learn the correct approach to scoring full marks in exams.
Can this worksheet be used for school assignments or only for home practice?+
This worksheet is versatile and can be printed for home practice, used as a school assignment, or given as a periodic test. Teachers can also modify difficulty or question numbers to suit classroom needs. It serves as excellent revision material before unit tests or annual exams for CBSE Class 8 Science students.
What is the difficulty level of the questions in this worksheet?+
The difficulty level is moderate, suitable for average to above-average CBSE Class 8 students. Section A and B have basic recall questions, Section C and D test understanding and application, and Section E includes HOTS questions for advanced learners. The case study tests competency-based skills as per the new CBSE pattern.
Does this worksheet help in preparing for CBSE board-style questions?+
Absolutely. The worksheet includes a variety of question types—MCQs, fill-in-the-blanks, true-false, short answers, long answers, and case-study questions—that mirror the latest CBSE Class 8 Science exam pattern. Practicing such worksheets regularly builds familiarity with question formats and boosts exam confidence significantly.
My child struggles with long-answer questions. How can this worksheet help?+
Section E contains three long-answer questions with detailed model answers in the answer key. By comparing their own answers with the model answers, students learn how to structure responses, which points to include, and how to present information clearly. Repeated practice with such questions improves writing skills and scoring ability in exams.
Are diagrams required for any questions in this worksheet?+
Yes, Question 26 in Section E asks students to describe the life cycle of a frog with a labelled diagram. Drawing and labelling biological diagrams is an important skill in CBSE Science exams, and this worksheet provides an opportunity to practice that skill under timed conditions with reference to the NCERT textbook illustrations.
How can I help my child if they get many answers wrong?+
First, review the chapter together from the NCERT Class 8 Science textbook. Identify specific weak areas—whether terms, processes, or examples—and make short notes. Encourage your child to redo incorrect questions after revision. For continuous support and instant doubt-clearing, platforms like CBSETUTOR.ai offer 24×7 AI tutoring at ₹999/month with a three-day free trial.
Can this worksheet be downloaded and printed easily?+
Yes, this worksheet is designed to be printer-friendly. You can copy the questions into a document, print them, and distribute to students. Ensure the answer key is printed separately or provided only after students complete the worksheet to encourage honest self-assessment and independent learning among Class 8 Science students.

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