Indicate whether the following statements are True (T) or False (F).
(a) Oviparous animals give birth to young ones. ( )
(b)Each sperm is a single cell. ( )
(c)External fertilisation takes place in frog. ( )
(d)A new human individual develops from a cell called gamete. ( )
(e)Egg laid after fertilisation is made up of a single cell. ( )
(f)Amoeba reproduces by budding. ( )
(g)Fertilisation is necessary even in asexual reproduction. ( )
(h)Binary fission is a method of asexual reproduction. ( )
(i)A zygote is formed as a result of fertilisation. ( )
(j)An embryo is made up of a single cell. ( )

AcademicBiologyNCERTClass 8

Correct Answer:

(a) Oviparous animals give birth to young ones. (False)

Explanation: Viviparous organisms never lay eggs and that is how they are different from oviparous and ovoviviparous organisms. Examples of viviparous organisms are- cats, dogs, humans, etc.


(b) Each sperm is a single cell. (True)


(c) External fertilization takes place in frogs. (True)


(d) A new human individual develops from a cell called a gamete. (False)

Explanation: The sex cells, or reproductive cells, which fuse together to reproduce a new organism, are called gametes. A zygote is a fertilized egg cell that forms by the union of a female gamete (egg, or ovum) with a male gamete (sperm)


(e) Egg laid after fertilization is made up of a single cell. (False)

Explanation: Fertilization is the process in which the nuclei of the egg and sperm unite together in the fallopian tube to form a single-celled zygote.


(f) Amoeba reproduces by budding. (False)

Explanation: An amoeba reproduces by the process of binary fissionThe cell of an Amoeba starts dividing after attaining its maximum size. The nucleus of the cell divides first, followed by the cytoplasm. Thus, the single cell divides into two identical cells.


(g) Fertilisation is necessary even in asexual reproduction. (False)

Explanation: In asexual reproduction, the offspring arises from a single type of parent and does not involve the fertilization process.


(h) Binary fission is a method of asexual reproduction. (True)


(i) A zygote is formed as a result of fertilization. (True)


(j) An embryo is made up of a single cell. (False)

Explanation: Fertilization is the process in which the nuclei of the egg and sperm unite together in the fallopian tube to form a single-celled zygote. This fertilized zygote undergoes repetitive cell division to form an embryo. The embryo further develops to form a fetus.

 



raja
Updated on 10-Oct-2022 12:46:33

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