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12th Standard English Medium Biology (Zoology) Subject Reproduction in Organisms Book Back 2 Mark Questions with Solution Part - II updated Book back Questions

Published on: 13/05/2022

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Questions:

Generic 2

5 x 2 = 10

Define conjugation.

Define hologamy.

What is autogamy?

What is epimorphosis?

Name the phenomenon where the female gamete directly develops into a new organism with an avian example.

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Answers Key:

Generic 2

5 x 2 = 10

conjugation is the temporary union of the two individuals of the same species. During their union both individuals, called the conjugants exchange certain amount of nuclear material (DNA) and then get separated. E.g. Paramecium

It is a type of fertilization. In lower organisms sometimes the entire mature organisms do not form gametes but they themselves behave as gametes and the fusion of such mature individuals is known as hologamy.
E.g. Trichonympha.

It is a type of fertilization In autogamy, the male and female gametes are produced by the same cell or same organism and both the gametes fuse together to form a zygote.
E.g. Actinosphaerium and Paramecium

(i) It is type of regeneration which involves replacement of the lost body pants. It is of two types.
(ii) Reparative regeneration, only, certain damaged tissue can be regenerated.
(iii) Restorative regeneration - several body parts can develop. E.g. Star fish

Parthenogenesis is the phenomenon in which female gamete directly develops into a new organism. (e,g:) Honeybee (male or drone).