Question

What are the various adaptations found in plants for cross pollination? Describe any two of them.

Answer 1

Answer:

Explanation:

Adaptations for Cross-Pollination:

Nature has some contrivances for preventing self-pollination and favouring cross-pollination:

1. Uni-Sexuality of Flowers:

In plants bearing unisexual flowers self-pollination is practically out of question and cross- pollination is inevitable.

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2. Self-Sterility:

In some plants pollen grains have no effect and arc. thus, sterile on the stigma of the same flower, e.g. Orchids.

3. Dichogamy:

In some bisexual flowers stamens and car­pels do not mature at the same time.

Answer 2

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Explanation:

When pollen reaches to the stigma of the same flower is self-pollination.

The adaptations appear in the self pollinated plants are Cleistogamy, Homogamy, Movement of floral parts, Incomplete dichogamy, safety mechanism.

Cross-pollination is the transfer of pollen to stigma to another flowers of another plant same species.

The adatations appear in the cross pollinated plants are unisexuality, dichogamy, herkogamy, heterostyly, pollen prepotency, self sterilty.....

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