Question

What guides and
promotes the growth
of pollen tube from
the pollen towards
the
ovule
for
fertilisation?
1. Phototropism
2. Geotropism
3. Hydrotropism
4. Chemotropism​

Answer 1

Answer:

chemotropism

Explanation:

For fertilization, 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. whereas phototropism is the growth towards the light, in hydrotropism is towards water and geotropism is towards force of gravity. So, the correct answer is option D.

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Answer 2

Explanation:

4. Chemotropism ..........