Most abundant/common type of pollen tetrad is _________ and it is formed due to _________ cytokinesis.

1. Tetrahedral, successive

2. Tetrahedral, simultaneous

3. Isobilateral, successive

4. Isobilateral, simultaneous

The pollen grain represents

1. Male gamete

2. Male gametophyte

3. Microsporophyll

4. Microsporangium

In what percent of angiosperms are the pollen grains shed at three cell stage?

1. 20

2. 40

3. 60

4. 80

The intine of the pollen grain is a:

1. Thick and discontinuous layer made of sporopollenin

2. Thick and continuous layer made of sporopollenin

3. Thin and discontinuous layer made of cellulose and pectin

4. Thin and continuous layer made of cellulose and pectin

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

1. cuticle

2. sporopollenin

3. lignin

4. cellulose

Which one of the following is resistant to enzyme action?

1. Cork

2. Wood fibre

3. Pollen exine

4. Leaf cuticle

Male gametes in angiosperms are formed by the division of:

1. microspore

2. generative cell

3. vegetative cell

4. microspore mother cell

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

1. cutin

2. suberin

3. sporopollenin

4. callose

The pollen grains are shed at two-celled stage in

1. 80% angiosperms

2. 40% angiosperms

3. 30% angiosperms

4. 60% angiosperms

Which among the following is not true about pollen grain?

1. Rich in nutrients.

2. Many species cause severe allergies and bronchial afflictions in some people often leading to chronic respiratory disorders– asthma, bronchitis, etc.

3. Pollen consumption has been claimed to increase the performance race horses.

4. Parthenium is used against pollen allergy.