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Assertion : Synergids of embryosac also ...

Assertion : Synergids of embryosac also help in fertilization in Angiosperms.
Reason : Obturators of synergids attract the pollen tube.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
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This section contains Assertion (A) and Reason (R) type questions. Each question has choices (1), (2), (3) and (4), out of which only one is correct. Assertion (A) Synergids of embryo sac help in fertilisation in angiosperms. Reason (R) Filiform apparatus of synergids secrete certain chemotropically active substance due to which pollen tube grows towards the embryo sac.

Synergids help in

Assertion :- Polygonum type of embryosac, is most common in angiosperm. Reason :- lt is found in most of Angiosperm plants

Obturator which helps in fertilization is outgrowht o:

Pollen tube in angiosperms act as

Obturators which help in fertilization are out growth of

Assertion (A) : Double fertilization is unique to angiosperms. Reason (R): Triple fusion occurs in both fertilization.

Describe the process of fertilization in angiosperms with the help of diagram.

Assertion Synergids are elongated cells that occur at the micropylar pole. Reason Synergids help in chemotropic movement of pollen tube.

MOTION-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Exercise - 4(AIIMS-2018)
  1. Assertion: Cleistogamous flowers are invariably autogamous. Reason : T...

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  2. Asertion :- Cleistogamy is disadvantageous for plants. Reason:- Clei...

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  3. Assertion :- Geitonogamy is functionaly cross pollination and genetica...

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  4. Assertion :- It is believed particularly for some bryophytes and pteri...

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  5. Assertion :- All aquatic plants use water for pollination. Reason :- ...

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  6. Assertion :- Both wind and water pollinated flowers are not very colou...

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  7. Assertion :- Non synchronised pollen release and stigma receptivity is...

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  8. Assertion :- In monoecious plants neither autogamy nor geitonogamy can...

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  9. Assertion :- Most zygotes divide only after certain amount of endosper...

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  10. Assertion :- Seed bearing plants like angiosperms show wide geographic...

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  11. Assertion :- Apomixis is a form of asexual reproduction that mimics se...

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  12. Assertion :- Endosperm increases the success rate of seedling developm...

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  13. Assertion : Clone is formed by amphimixis. Reason : ln amphimixis, ne...

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  14. Assertion : Synergids of embryosac also help in fertilization in Angio...

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  15. Assertion : When embryo sac develops from megaspore mother cell withou...

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  16. Assertion : Pollen tube shows apical growth. Reason : Growth of polle...

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  17. Assertion :- Development of pollen grains begins only after pollinatio...

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  18. Assertion :- ln Angiosperms, sexual reproduction takes place through t...

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  19. Assertion :- The main plant of angiosperm is in the form of sporophyte...

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  20. Assertion :- Polygonum type of embryosac, is most common in angiosperm...

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