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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12047076
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Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

  • cutin

  • suberin

  • sporopollenin

  • callose

Solution

C.

sporopollenin

Exine is outer layer of pollen grain which is acetolysis resistant layer. It is also resistant to physical and biological degradation. Because of this property of exine, pollen grains are found well preserved for long periods in fossil deposits.

Cutin is a waxy repellant substance in the cuticle of plants, consisting of higly polymerized esters of fatty acids.

Suberin is an  inert impermeable waxy substance present in the cell walls of corky tissues.

Callose is a plant polysaccharide. It plays an important in plant development.

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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