In the T.S. of a

Function:

a) Sporogenous tissue- each cell is capable of giving rise to a microspore tetrad.

b) Tapetum- it provides nutrients to developing pollen grains.

Explanation:

OR

• Cleistogamy is the self-pollination that occurred in cleistogamous flowers that do not open at all.

• The anthers and stigma both present close to each other.

Advantages:

• This type of self-pollination does not require an external agent for pollination.

• It helps in producing pure lines.

Disadvantages:

• This type of self-pollination does not help in producing new varieties and species.