Development of Male Gametophyte

Q.

what is the function of germ pore in exine of the pollen grain?

Q. A generative cell wall was destroyed by laser but later a normal pollen tube still formed. This probably occured because -

1. Vegetative cell was not damaged
2. Contents of killed generative cell stimulate pollen growth
3. Laser beam stimulates growth of pollen tube
4. The region of emergence of pollen tube is not harmed

Q. What are parthenocarpic fruits?

1. Fruits enclosed in pods such as pea.
2. Fruits formed without fertilization.
3. Very hard fruits.
4. Fruits with more than one seed at their centre.

Q.

The cells present in a mature pollen grain after the first mitotic division are -

1. Vegetative cell

2. Generative cell

3. Both A and B

4. Antipodal cells

Q.

What is the shape of the generative cell in pollen grain?

1. Irregular

2. Spindle

3. Spherical

4. Circular

Q. Male gametophyte in angiosperms produces -

1. three sperm cells
2. single sperm cell and two vegetative cells
3. two sperm cells and a vegetative cell
4. single sperm cell and a vegetative cell

Q. Root cells of wheat have $2n=42$ chromosomes. Which of the following is the basic chromosome number of wheat?

1. 7
2. 21
3. 14
4. 42