Reproduction in Animals Important Questions Answer
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Q1. What is a gamete? What is the difference between unisexual and bisexual organisms?
Answer: Gamete – Reproductive cells produced by reproductive organs are called gametes. Gametes are of two types: male and female. Fusion of gametes leads to fertilization.
Unisexual organisms – Organisms that have only one type of reproductive organ; either male or female.
Bisexual organisms – Organisms that have both reproductive organs.
Q2. Define ovulation.
Answer: Ovulation – The process of releasing an egg by the ovary is called ovulation. The egg is released on the 14th day of a 28-day menstrual cycle.
Q3. What is reproduction? What are its types?
Answer: Reproduction – All living beings on Earth show a specific life cycle that includes birth, growth, maturity, reproduction, and death. Reproduction is an important process that ensures continuity from one generation to the next. New and young organisms replace adult and old organisms through reproduction. There are two types of reproduction:
(i) Asexual reproduction
(ii) Sexual reproduction.
Q4. How many ways are there for reproduction in plants and animals?
Answer: Two – (a) Sexual (b) Asexual.
Q5. How many organisms are required for asexual reproduction?
Answer: One.
Q6. How many organisms are required for sexual reproduction?
Answer: Two.
Q7. What are the special cells in reproductive organs?
Answer: Gametes.
Q8. Name two animals that reproduce through fragmentation.
Answer: (1) Amoeba (2) Paramecium.
Q9. In which organisms does budding remain attached to the parent body?
Answer: Sponges, corals.
Q10. What is a zygote?
Answer: Zygote – The first structure formed by the fusion of male and female gametes.
Q11. What is fertilization?
Answer: Fertilization – The fusion of male and female gametes.
Q12. Give two examples of hermaphroditic animals.
Answer: (i) Earthworm (ii) Leech.
Q13. Which is larger, an ovum or a sperm?
Answer: Ovum.
Q14. Give two examples of organisms with external fertilization.
Answer: (1) Frog (2) Fish.
Q15. Define metamorphosis.
Answer: Metamorphosis – The process of transformation from a larva to an adult through significant changes.
Q16. In which type of reproduction are male and female not required?
Answer: Asexual reproduction.
Q17. What are gonads? Name the male and female gonads in humans.
Answer: Gonads – Organs that produce gametes are called gonads.
Male gonads in humans – Testes.
Female gonads in humans – Ovaries.
Q18. Name the male and female gametes.
Answer: Male gamete – Sperm.
Female gamete – Ovum.
Q19. Give one example each of external and internal fertilization.
Answer: External fertilization – Frog.
Internal fertilization – Human.
Q20. What is the function of the vas deferens?
Answer: The vas deferens transfers sperm from the testes to the uterus.
Q21. What is hymen?
Answer: Hymen – A thin membrane covering the external opening of the vagina, which is perforated for menstrual flow.
Q22. Who was the first test-tube baby?
Answer: Louise Joy Brown.
Q23. What type of asexual reproduction occurs in Hydra?
Answer: Budding.
Q24. Define cloning.
Answer: Cloning – The artificial production of an identical cell, any other living part, or a complete organism.
Q25. Which animal was successfully cloned by Ian Wilmut at the Roslin Institute in Edinburgh, Scotland?
Answer: Dolly the sheep.
Q26. Name the first mammal to be cloned.
Answer: Dolly the sheep, born on July 5, 1996.
Q27. What is reproduction?
Answer: Reproduction – The process by which organisms produce offspring similar to themselves.
Q28. What is the function of the tail in a human sperm?
Answer: To provide motility.
Q29. What is ovulation?
Answer: Ovulation – The process of releasing an ovum from the ovary.
Q30. What is a test-tube baby?
Answer: A baby conceived outside the human body through artificial fertilization is called a test-tube baby.
Q31. Write the full name of IVF.
Answer: In Vitro Fertilization.
Q32. Where does the development of a test-tube baby take place?
Answer: In the uterus.
Q33. What are oviparous animals?
Answer: Animals that lay eggs are called oviparous animals.
Q34. What are viviparous animals?
Answer: Animals that give birth to live young are called viviparous animals.
Q35. When did Dolly the cloned sheep die?
Answer: February 14, 2003.
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