Reproduction in Animals

Q23. What type of asexual reproduction take place in amoeba?

Ans. Amoeba reproduces by the common asexual reproduction method called binary fission.

Q24. Who cloned Dolly the sheep?

Ans. Dolly was cloned by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland.

Q25. What purpose does the tail in a sperm serve?

Ans. Tail allows the sperm to become motile, hence helps the sperm to reach female gametes for fusion. 

Q26. What is cloning?

Ans. Cloning is the production of an exact copy of a cell, any other living part, or a complete organism.

Q27. What are the two modes of reproduction in animals?

Ans. There are two modes by which animals reproduce. These are: (i) Sexual reproduction, and (ii) Asexual reproduction.

Q28. What are the reproductive organs in humans which produce the gametes?

Ans. The ovary produces female gametes called ova and the testes produce male gametes called sperms.

Q29. Which life process ensures that a plant or animal species will not disappear from the earth?

Ans. Reproduction is the life process ensures that a plant or animal species will not disappear from the earth.

Q30. Explain the importance of reproduction in organisms.

Ans. Reproduction is essential for the continuation of a species. It ensures the continuation of similar kinds of individuals, generation after generation.

Q31. What is an embryo?

Ans. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed as an embryo.

Q32. Name the technique which is used to help a woman with blocked oviducts to have a baby.

Ans. IVF or in vitro fertilization (fertilization outside the body) is the technique which is used to help a woman with blocked oviducts to have a baby.

Q33. Describe the process of fertilization in human beings.

Ans. The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.

Q34. How does a hydra reproduce?

Ans. Hydra reproduces asexually by the process of budding. A small outgrowth called ‘bud’ is formed on the side of its body. This bud then grows gradually to form a small hydra. And finally the tiny new hydra detaches itself from the body of parent hydra and lives as a separate organism.

Image from NCERT

Q35. Give two differences between a zygote and a foetus.

Ans. Differences between a zygote and a foetus

Q36. Give two differences between zygote and embryo.

Ans. Differences between zygote and embryo