CBSE Class 10 Science 2016 Term II Outside Delhi Set 1
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Question : 13 of 36
Marks:
+1,
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(a) List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
(b)
(ii) How does 'A' reaches part 'B' ?
(iii) State the importance of the part ' '.
(iv) What happens to the part marked ' ' after fertilisation is over?
(b)
(i) Name the part marked ' ' in the diagram.
(ii) How does 'A' reaches part 'B' ?
(iii) State the importance of the part ' '.
(iv) What happens to the part marked ' ' after fertilisation is over?
Solution:
(a) Variation is seen among progeny formed by sexual reproduction because.
(i) Involvement of two different individuals.
(ii) Creation of new combination of variants.
(b) (i) pollen grains
(ii) Pollen grain reaches Stigma by pollination
(iii) Pollen tube helps male gamete to reach the egg (ovule)
(iv) After fertilisation it converts into embryo.
(i) Involvement of two different individuals.
(ii) Creation of new combination of variants.
(b) (i) pollen grains
(ii) Pollen grain reaches Stigma by pollination
(iii) Pollen tube helps male gamete to reach the egg (ovule)
(iv) After fertilisation it converts into embryo.
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