Development of Male Gametophyte

Q.

How tapetal cells could become bi-nucleate?

Q.

How many male gametes are produced by pollen grains?

Q.

Mention one application of pollen bank. How is pollen stored in a bank?

Q.

How many pollen grains and how many mitotic divisions are required to produce 100 male gametes?

1. 50 Pollen grains and 100 mitotic divisions
2. 50 Pollen grains and 50 mitotic divisions
3. 100 pollen grains and 100 mitotic divisions
4. 50 pollen grains and 200 mitotic divisions.

Q. Ploidy level of nucellus, endosperm, polar nuclei, Megaspore mother cell, female gametophyte respectively are

1. 2n, 3n, n, 2n, n
2. 2n, 3n, 2n, n, n
3. n, 2n, n, 2n, n
4. 2n, 3n, 2n, 2n, n

Q. Pollen grains are shed at _________.

1. 1-celled stage
2. 2-celled stage
3. 3-celled stage
4. 2-celled or 3-celled stage

Q. What is emasculation? Why and when is it done?

Q.

Male gametes in angiosperms are formed by the division of

1. Microspore

2. Vegetative cell

3. Generative cell

4. Microspore mother cell

Q. The mitotic division that takes place in the generative cell of pollen grain results in the formation of ________.

1. 3 male gametes
2. 2 male gametes
3. 2 male gametes and one vegetative cell
4. one male gamete and one vegetative cell.

Q.

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

1. Irregular

2. Spherical

3. Spindle

4. Circular

Q.

The most common type of ovule in angiosperms is

1. Anatropous ovule

2. Amphitropous ovule

3. Orthotropous ovule

4. Antropous ovule

Q.

Transmission tissue is a characteristic feature of:

1. Wet stigma

2. Dry stigma

3. Solid style

4. Hollow style

Q.

If there are 4 pollen mother cells in anther, what will be the number of pollen grains?

1. 16

2. 12

3. 8

4. 4

Q. __________________ directly develops into male gametophyte in angiosperms.

1. Microspore
2. Microsporangia
3. Sporogenous tissue
4. Endothecium

Q.

Explain how fertilization takes place after the pollen grains land on the stigma of the receiving flower.

Q. Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because

1. laser beam stimulates pollen germination and pollen tube growth.
2. the laser beam does not damage the region from which pollen tube emerges.
3. the contents of killed generative cell permit germination and pollen tube growth.
4. the vegetative cell has not been damaged.

Q. Which of the following events take place after double fertilisation?

1. The pollen grain germinates on the stigma
2. The pollen tubes enter the embryo sac
3. Two male gametes are discharged into the embryo sac
4. The PEN (primary endosperm nucleus) develops into endosperm

Q.

Meaning of-

Double fertilisation

Polar nuclei

Synergids

Antipodal cells

Q. If a hypothetical microspore mother cell is tetraploid. What will be the ploidy of the microspore?

1. Haploid
2. Tetraploid
3. None of the above
4. Diploid

Q. Which of the following is the correct bar chart representing the number of chromosomes in the given plant parts if its microspore has 20 chromosomes?

1. 
2. 
3. 
4. 

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. Identify ‘a’ and ‘b’ in the image given below

1. a - vegetative cell, b - generative cell
2. a - generative cell, b - vegetative cell
3. a - generative cell, b - nucleus
4. a - nucleus, b - vegetative cell

Q. After demonstration of totipotency, a botanist wishes to produce identical plants from different parts of angiosperm by tissue culture. He started with anther. The parts or tissues of anther which are likely to yield haploid embryos are:

1. Endothecium
2. Sporogenous tissue
3. Tapetal tissue
4. Middle layer

Q. Which among the following phenomena is not a part of anther dehiscence?

1. Imbibition and swelling up of anther
2. Release of pollen grains
3. Dehydration
4. Disintegration of the strip between the pollen sacs

Q. ___________ divides mitotically to form male gametes.

1. Vegetative cell
2. Microspore
3. Generative cell
4. Pollen mother cell (PMC)

Q.

Pollen grain of the plant whose 2n=28 are cultured to get callus by tissue culture method what would be the number of chromosome in the cells of the callus ?

Q. Reductional division takes place in _____________ during microsporogenesis.

1. tapetum
2. microspores
3. microspore mother cell
4. endothecium

Q. How tapetal cells could become bi-nucleate?

Q. The body of ovule is upright in position the micropyle, chalaza and hilum lie in one straight line. The type is:

1. Orthotropous
2. Anatropous
3. Circinotropous
4. Amphitropous

Q. To produce 102 pollen grains, how many meiotic divisions are required?

1. 25
2. 25.5
3. 27
4. 26