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Sexual Reproduction In Flowering Plants

Question

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Describe the structure of microsporangium.

Solution

A microsporangium is often circular in outline in transverse section.

1.It is surrounded by four layers:

a. The outermost is the single layer of epidermis.

b. The second layer is endothecium, where cells develop thickenings.

c. Middle layer is of 2-4 cells.

d. Tapetum, the innermost layer which provides nutrition to the developing pollen cells. The cells of tapetum may be multinucleate.

2. There are four pollen sacs.

3. There is a group of compactly arranged homogenous cells called sporogenous tissue in the centre of each sac.

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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