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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)

Explanation: Chemotropism is growth towards the chemical stimulus. For fertilization to take place, pollen grains follow a chemotropic mechanism where the growth of the pollen tube is towards the ovules. During fertilization, the ovary releases chemicals that trigger the chemotropic response from developing pollen tubes. Hydrotropism is growth towards the water, phototropism is towards the light, and geotropism is towards the force of gravity. Hence, (b) is the correct option.

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