NCERT Class VIII Science Solutions: Chapter 9-Reproduction in Animals Part 2

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Question 4:

Indicate whether the following statements are True (T) or False (F):

  1. Oviparous animals give birth to young ones. ( )

  2. Each sperm is a single cell. ( )

  3. External fertilization takes place in frog. ( )

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

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

  6. Amoeba reproduces by budding. ( )

  7. Fertilization is necessary even in asexual reproduction. ( )

  8. Binary fission is a method of asexual reproduction. ( )

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

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

Answer:

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

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

  3. External fertilization takes place in frog. (True)

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

  5. Egg laid after fertilization is made up of a single cell. (True)

  6. Amoeba reproduces by budding. (False)

  7. Fertilization is necessary even in asexual reproduction. (False)

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

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

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

Question 5:

Give two difference between a zygote and a fetus.

Answer:

  • Zygote is single cellular whereas fetus is a multicellular.

  • Well defined body parts are absent in zygote whereas in fetus body parts can be identified.

As showing in images is a Fertilization and Zygote

Fertilization and Zygote

Question 6:

Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Answer:

Asexual reproduction is a mode of reproduction in which only one parent is involved to reproduce offspring. In asexual reproduction, the offspring’s produced are exact copies of their parents.

It is generally observed in very small sized organisms. Binary fission, Budding, Fragmentation etc. are the examples of asexual reproduction.

  • Budding: In this mode, a part of the organism starts bulging out. Slowly it grows and develops into a separate individual. Examples: Hydra, yeast.

  • Binary Fission: It is a type of asexual reproduction in which a single cell divides into two halves. Organisms that reproduce through binary fission are bacteria and Amoeba.

Question 7:

In which female reproductive organ does the embryo get embedded?

Answer:

The embryo gets embedded in wall of the uterus.

The embryo, once attached to uterus gradually develops various body parts such as hands, legs, head, eyes, etc into an embryo.

Developed by: