Microsporogenesis

Q. How many haploid nuclei are present in a mature pollen grain?

1. One
2. Two
3. Three
4. Four

Q.

Cones or strobili are found in

1. Psilotum

2. Dryopteris

3. Selaginella and Dryopteris

4. Selaginella and Equisetum

Q. Select the option depicting the correct order of development in an anther.

1. Pollen grain$\to$ sporogenous tissue $\to$ microspore $\to$ pollen mother cell
2. Sporogenous tissue $\to$ male gametes $\to$pollen mother cell $\to$ pollen grain
3. Sporogenous tissue $\to$ microspore $\to$male gametes $\to$ pollen grain
4. Sporogenous tissue $\to$ pollen mother cell $\to$ microspore $\to$ pollen grain

Q.

The process of reduction division of __ tissue is termed microsporogenesis.

Q. Which one of the following alternatives represents the gametophytic phase in pinus?

1. pinus plant
2. Zygote
3. Micro and mega spores
4. Male and female cones

Q.

Arrange the following terms in the correct developmental sequence:

Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes

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. 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.

Which of the following is NOT correct regarding a pollen grain.

1. Germ pores are regions in exine that lack exine and sporopollenin.

2. Hard outer layer of pollen is called Exine

3. There are no pores present on exine.

4. Sporopollenin is a material highly resistant to strong acids.

Q.

Give a brief account of prothallus.

Q.

If each microsporangium contains 75 pollen mother cells (PMCs), what is the maximum number of pollen grains produced by a Datura flower?

1. 300

2. 1200

3. 6000

4. 3000

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.

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

1. True

2. False