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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12047223
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Exine of pollen grain is made up o

  • pectocellulose

  • lignocellulose

  • sporopollenin

  • pollen kit

Solution

C.

sporopollenin

Pollen grains are spherical in shape. They are 25-50 micrometres in diameter. It has a prominent two-layered wall. The hard outer layer called the exine is made up of
sporopollenin. It can withstand high temperatures and strong acids and alkali. Pollen grains are well preserved as fossils because of the presence of sporopollenin. Pollen grain exine has prominent apertures called germ pores, where sporopollenin is absent. The inner wall of the pollen grain, intine is a thin and continuous layer made up of cellulose and pectin.

Some More Questions From Sexual Reproduction in flowering Plants Chapter

The fertilization occurs in the :

The female gametophyte of a typical dicot at the time of fertilization is:

Development of embryo  from any cell of nucellus is called :

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 ....................

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