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Micronutrients

Which of the ...

Question

Which of the following promote pollen germination and tube growth?

A

Starch

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B

Boron

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C

Mg

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D

Potassium

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Solution

The correct option is B Boron
Boron significantly promotes the germination of pollen and tube growth. It helps in uptake and utilization of calcium, membrane functioning, cell elongation, cell differentiation, carbohydrate translocation.

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Q. Which one of the following pairs of elements would initiate and promote pollen germination?

Q. Which of the following is an outbreeding device?

a. If pollen release and stigma receptivity are not synchronized.

b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower.

c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

d. Production of the unisexual flower.

Q. What guides and promotes the growth of pollen tube from the pollen towards the ovule for fertilisation?

Q. Draw the diagram showing the germination of pollen on stigma and label the following parts (i) stigma (ii) pollen tube

Q. Assertion :Self-incompatibility is a genetic mechanism which prevents self-pollination and thereby fertilisation by inhibiting either pollen germination or pollen tube growth in the pistil. Reason: In gametophytic self-incompatibility, the incompatibility reaction is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.

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