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  • The growth of pollen tubes towards ovules is due to (a) hydrotropism (b) chemotropism (c) geotropism (d) phototropism

The growth of pollen tubes towards ovules is due to
(a) hydrotropism
(b) chemotropism
(c) geotropism
(d) phototropism

Answers (1)

Answer: B

Solution: Chemotropism is growth towards the chemical stimulus. For fertilization to take place, pollen grains follow chemotropic mechanism where the growth of the pollen tube is towards the ovules. During fertilization, ovary release chemicals that trigger the chemotropic response from developing pollen tube. Hydrotropism is growth towards water, phototropism is towards the light, and geotropism is towards force of gravity.

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