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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12047496
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In Zostera, the marine angiosperm, the pollen grains are long ribbon-like and without exine. They have same specific gravity as that of water. How is this feature helpful in their pollination?

  • The pollen grains become unwettable

  • The pollen grains spread over large and they are lighter

  • The pollen grains can float below the surface of water

  • None of the above

Solution

C.

The pollen grains can float below the surface of water

In Zostera, the marine angiosperm, the pollen grains are long ribbon-like and without exine. They have some specific gravity as that of water. The pollen grains can therefore, float below the surface of water. This helps in their pollination.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

Parthenocarpic fruit is :

The entry of pollen tube into embryo sac through the integuments is termed as :

512 microspores will be formed following meiosis of how many microspore mother cells.

Pollination by water occurs in :

In ................... flowers, the thalamus grows upwards completely enclosing the ovary, and the stamens, petals and sepals are borne above the ovary.

In Calotropis, all the microspores of anther lobe remain united to form

Albuminous seeds store reserve food materials in ....................

Transfer of pollen grains from the anther to the stigma of another flower of same plant is called..............................

The...................direct the growth of pollen tube towards egg apparatus by secreting some chemical substances.

A kind of reproduction in which the new individuals are formed without involvement of meiosis and syngamy.

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