Development of Male Gametophyte

Q.

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

1. Irregular

2. Spindle

3. Circular

4. Spherical

Q.

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

1. Vegetative cell

2. Generative cell

3. Sperm

4. Antipodal cells

Q. Male gametophyte in angiosperms produces -

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

Q. What is the function of germ pore?

1. Emergence of radicle
2. Initiates formation of male gametes
3. Initiation of pollen tube
4. Release of male gametes

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

Q.

Mark the correct pairs(s) with respect to post fertilization structure & events in flowering plants.

(a) Integuments – Pericarp

(b) Definitive nucleus – Endosperm

(c) Synergids – Degenerate

(d) Micropyle – Hilum

1. only b & c

2. a, b & c

3. a, b, c & d

4. only a & b

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

1. Irregular

2. Spindle

3. Spherical

4. Circular