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Self-incompatibility in plants is an ada...

Self-incompatibility in plants is an adaptation which promotes cross pollination. How?

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In such condition, pollen grains of a flower are incapable of effecting fertilisation even if they are placed on stigma of the same flower due to mutual inhibition.
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Cross pollination is

Cross pollination produces

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.

Intraspecific cross pollination is

Progeny resulting in cross pollination :-

Read the following five statements (A -E ) and answer the question. A. Pollination by water is more common amongst abiotic pollinating agent. B . Pollination by water is quite rare in flowering plants. C . Water hyacinth and water lily. The flowers emerge above the level of water and are pollinated by water. D. Wind pollinated plants numerous flowers packed into an inflorescence. E. Self incompatibility is an outbreeding device which prevents inbreeding . How many of the above statement are correct ?

Which is not a correct explanation of cross pollination

A mechanism to prevent cross pollination is

Which of the following is the wrong match between the plant and its character for adaptation of cross pollination

Which of these is not a contrivance for cross pollination ?

ICSE-SEXUAL REPRODUCTION IN FLOWERING PLANTS -COMPETITION CORNER ( OBJECTIVE TYPE QUESTIONS (ASSERTION AND REASON TYPE QUESTIONS ( FOR AIIMS ASPIRANTS )))
  1. Self-incompatibility in plants is an adaptation which promotes cross p...

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  2. Assertion: Endosperm of angiosperms is generally triploid (3n). Re...

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  3. [A] : Dispersal of fruits in Xanthium takes place by wind and water. ...

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  4. Assertion: Fruits are formed only in angiosperms. Reason: Fruits de...

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  5. Assertion: Seed plants are highly evolved. Reason: Seeds are found ...

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  6. [A] : In Apomixis , plants of new genetic sequence are produced . [R...

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  7. Assertion: Ovule is ategmic in Santalum. Reason: Ovule without inte...

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  8. Assertion: Dichogamy refers to maturation of male and female sex organ...

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  9. Assertion: Some fruits are seedless or contain empty or nonviable seed...

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  10. Assertion: The fruits of groundnut are not nuts but underground pods. ...

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  11. Assertion: Entomophilous plants produce less pollen when compared to a...

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  12. [A] : The time involved between pollination and fertilization varies f...

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  13. Assertion: Cross-pollination results in healthy and stronger offspring...

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  14. Assertion: Red colour of flowers attracts butterflies and wasps, but n...

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  15. Assertion: A flower is modified shoot. Reason: All the floral parts...

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  16. Assertion: Continued self-pollination generation after generation resu...

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  17. Assertion: Insects visit flowers to gather honey. Reason: Attractio...

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