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Mention two strategies evolved to preven...

Mention two strategies evolved to prevent self-pollination in flowers.

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Flowering plants have developed many devices to discourage self pollination and to encourage cross pollination.
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Contrivance for self-pollination is

Wind pollinated flowers are

Self incompatibility and dioecious condition are two devices for discouraging self pollination in plants. Explain the two.

Assertion: Flowering plants have developed many out breeding devices to discourage self-pollination and to encourage cross-pollination. Reason: Continued self-pollination result in inbreeding depression.

In most plants continuous self pollination leads to inbreeding depression while in others certain devices that help to discourage self pollination. Give any four devices.

MAXIMUM PUBLICATION-SEXUAL REPRODUCTION IN FOLLOWING PLANTS-EXERCISE
  1. With a neat digram explain the 7-celled , 8-nucleate nature of the fem...

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  2. What are cleistogamous flowers? Can cross-pollination occur in cleisto...

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  3. Mention two strategies evolved to prevent self-pollination in flowers.

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  4. Apomictic ernbryos in Citrus arise from

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  5. Wind pollinated flowers are

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  6. Which of the following statements about sporopollenin is wrong?

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  7. Egg apparatus of angiosperms consist of One synergid and two egg ce...

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  8. In some organisms, karyokinesis is not followed by cytokinesis as e re...

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  9. During the formation of embryo sac, the functional megaspore undergoes

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  10. One adavantage of Cleistogamy is

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  11. Which one of the following statements is not true?

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  12. Sporopollenin is chemically

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  13. Which one of the following pairs of plant structures has haploid numbe...

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  14. What does filiform apparatus do at the entrance into ovule. It

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  15. Which one of the following plant products is the hardest ?

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  16. A typical angiosperm embryo sac at maturity is

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  17. Why sometimes, even diploid offspring is produced through parthenogene...

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  18. Pollen grains are stored for long period without losing its viability ...

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  19. Filliform apparatus of an embryosac is located at

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  20. Double fertilization is very common in

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