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12th Standard English Medium Biology (Botany) Subject Asexual and Sexual Reproduction in Plants Book Back 3 Mark Questions with Solution Part - I updated Book back Questions

Published on: 13/05/2022

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Std: 12th Standard - Biology

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Questions:

Generic 5

1 x 5 = 5

Discuss the importance of Modern methods in reproduction of plants.

Generic 2

3 x 2 = 6

“The endosperm of angiosperm is different from gymnosperm”. Do you agree. Justify your answer.

List any two strategy adopted by bisexual flowers to prevent self-pollination.

What is Cantharophily.

Generic 3

1 x 3 = 3

What is endothelium

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Answers Key:

Generic 5

1 x 5 = 5

Advantages of modern methods
(i) Plants with desired characteristics can be multiplied rapidly in a short duration.
(ii) Plants produced are genetically identical.
(iii) Tissue culture can be carried out in any season.
(iv) Plants which do not produce viable seeds and seeds that are difficult to germinate can be propagated.
(v) Rare and endangered plants can be propagated. Disease-free plants can be produced cells can be genetically modified and transformed.

Generic 2

3 x 2 = 6

The endosperm in gymnosperms is haploid because it is formed from the haploid megaspore. In angiosperm the endosperm is triploid, a product or triple fusion.

Dichogamy stamens and stigmas mature at different times (protandry, Protogyny) Herkogamy - Stamens and stigmas are arranged in such a way, self pollination become impossible.

Pollination carried out by beetle is called cantharophily.

Generic 3

1 x 3 = 3

In some species (unitegmic, tenuinucellate) the inner layer of integument becomes specialized, The layer is nutritive in function for the embryosac. This layer is called endothelium or integumentary tapetum.
Example:
Asteraceae.