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Sexual Reproduction In Flowering Plants

Question
CBSEENBI12002378
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Which one of the following statements is wrong?

  • When pollen is shed at two-celled stage, double fertilization does not take place

  • Vegetative cell is larger than generative cell

  • Pollen grains in some plants remain viable for months

  • Intine is made up of cellulose and pectin

Solution

A.

When pollen is shed at two-celled stage, double fertilization does not take place

Before pollination the protoplast of pollen grain divides into two unequal cells small generative cell and large tube or vegetative cell. In some species the generative cell divides into two male gametes prior to dehiscence of pollen grain. Therefore at the time of pollination the pollen grain is either 2-celled or 3-celled. 

Some More Questions From Sexual Reproduction in flowering Plants Chapter

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.

A kind of self-pollination in which the pollens from the anthers of one flower are transferred to the stigma of another flower borne on the same plant.

Give the term for cross-pollination by  wind.

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