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In over 60 percent of angiosperms, polle...

In over 60 percent of angiosperms, pollen grains are shed at

A

Two-celled stage

B

Three-celled stage

C

Four-celled stage

D

Either A or B

Text Solution

Verified by Experts

The correct Answer is:
A
In over 60 per cent of angiosperms (mostly dicots), pollen grains are shed at 2-celled stage. In the remain ing species, the generative cell divide mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).
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Knowledge Check

  • In 40 percent of angiosperms, pollen grains are shed at

    A
    2 - celled
    B
    3 - celled
    C
    4 - celled
    D
    5 - celled

  • Read the following statements carefully and select the appropriate option given below. (i) The distal end of the filament is attached to the thalamus or the petal of the flower. (ii) The pollen grains represent the male sporophyte. (iii) The microsporangia develop further and become embryo sac. (iv) In over 60 per cent of naked seeded plant, pollen grains are shed at this 2-celled stage. (v) As anthers mature and dehydrate the microspores, dissociate from each other and develop into pollen grains.

    A
    One statement is incorrect.
    B
    Two statements are incorrect.
    C
    Three statements are incorrect.
    D
    Four statements are incorrect.

  • Winged pollen grains are present in

    A
    Mustard
    B
    Cycas
    C
    Mango
    D
    Pinus

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    The pollen grains represent the male gametophytes. Describe the structure of mature pollen grains at released stage in common plants.

    In pollen banks pollen grains are stored in________at -196^@C .

    The generative cell of a pollen grain

    The branch of botany which deals with the study and various aspects of spores and pollen grains is called

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