Microsporogenesis

Q. Which among the following is the correct developmental sequence during microsporogenesis?

1. Pollen grain - microspore tetrad- pollen mother cell- male gametes
2. Male gametes - pollen mother cell - pollen grain - microspore tetrad
3. Microspore tetrad - pollen mother cell - male gametes - pollen grain
4. Pollen mother cell - microspore tetrad - pollen grain - male gametes

Q. If the number of chromosomes present in a pollen mother cell (PMC) is 48, then the number of chromosomes present in the microspore is____.

1. 24
2. 48
3. 12
4. 56

Q. Assertion (A): Developed male gametophytes of angiosperms have 3 cells
Reason (R): In all angiosperms, the male gametophyte has only two male gametes

1. A is true but R is false
2. Both A and R are true and R is the correct explanation of A
3. Both A and R are true and R is not the correct explanation of A
4. Both A and R are false

Q. Assertion (A): Developed male gametophytes of angiosperms have 3 cells
Reason (R): In all angiosperms, the male gametophyte has only two male gametes

1. Both A and R are true and R is the correct explanation of A
2. A is true but R is false
3. Both A and R are true and R is not the correct explanation of A
4. Both A and R are false

Q.

The mitocytes, meiocytes and meiospores present in the anther respectively are

1. Pollen tetrads, sporogenous cells, microspores

2. Sporogenous cells, pollen mother cells, pollen grains

3. Microspores, pollen grains, sporogenous cells

4. Microspore mother cell, microspores, pollen grains

Q.

Meiotic division of a cell results in formation of four daughter cells.

1. True

2. False

Q.

Which of the following is correct about pollen grain?

1. They do not contain much nutrition.

2. They die during winter season.

3. They are not allergic at all.

4. They can survive for thousands of years.

Q.

What would be the number of chromosomes in (i) microspore mother cell and (ii) microspore if the sporogenous cell has 20 chromosomes?

1. (i) 10, (ii) 20

2. (i) 10, (ii) 10

3. (i) 20, (ii) 20

4. (i) 20, (ii) 10

Q.

What would be the number of chromosomes in (i) microspore mother cell and (ii) microspore if the sporogenous cell has 20 chromosomes?

1. (i) 10, (ii) 20

2. (i) 10, (ii) 10

3. (i) 20, (ii) 20

4. (i) 20, (ii) 10