Question

18. The growth of pollen abes towards ovules is due to
(a) Hydrotropium (b) chemotropism (e) geotropism (d) photobopian
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Answer 1

Answer:

b) Chemotropism. is the answer.

Explanation:

The growth of a pollen tube towards ovule is induced by a chemical (sugar) substance secreted by the ripened stigma of flower into the style towards ovary. It is an example of chemotropism, pollen grain responds to stimulus by growing a polen tube in downward direction, towards ovule for fertilisation.

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Answer 2

Chemotropism is a wee for given question