Microsporogenesis

Q.

Explain double fertilization in plants?

Q. The process of fusion of a male gamete with an egg and the other gamete with a secondary nucleus is known as:

1. Parthenocarpy
2. Double fertilisation
3. Triple fusion
4. Emasculation

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. Which of the following is NOT a part of the pistil?

1. Stigma
2. Anther
3. Ovary
4. Style

Q. Pollen grains are formed by _________ division in locules of anthers.

1. equational
2. meiotic
3. both meiotic and mitotic
4. mitotic

Q.

At the time of entering into ovule, pollen tube has_________.

1. three male nuclei

2. two male nuclei

3. four male gametes

4. one gamete nucleus

Q.

When the pollen tube enters into the embryo sac, pollen tube has:

1. Three male nuclei

2. Two male nuclei

3. One gamete nucleus

4. Four male gametes

Q.

The number of pollen grains, produced by each inflorescence of family Asteraceae having 10 actinomorphic flowers (given that each anther produces 20 pollen grains), are:

1. 300

2. 1000

3. 800

4. 500

Q.

The ratio between pollen mother cell and microspores produced during microsporogenesis is -

1. 3: 4

2. 4 :1

3. 1: 3

4. 1: 4

Q.

How many meiotic divisions of the pollen mother cell (PMC) are required to produce 1000 pollen grains?

1. 200

2. 250

3. 500

4. 100

Q. Which of the following is/are pre-fertilisation events?

1. Megasporogenesis
2. Development of female gametophyte
3. Microsprogenesis
4. All of the above

Q.

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

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. Which cell of the gametophyte of a normal angiosperm ($Capsella$) is diploid at the time of fertilization?

1. Prothallial cell/vegetative cell
2. Antiprodal cell and synergids
3. Secondary nucleus
4. Generative cell

Q.

Which one of the following is surrounded by a Callose wall?

1. Microspore mother cell

2. Male gamete

3. Egg

4. Pollen grain

Q.

Sporogenous tissue → (i) →Microspore mother cells → (ii) → Microspore tetrads
Identify (i) and (ii) in the above sequence.

1. (i) - Meiosis, (ii) - Meiosis
2. (i) - Mitosis, (ii) - Mitosis

3. (i) - Mitosis, (ii) - Meiosis

4. (i) - Meiosis, (ii) - Mitosis

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. Segments of tapeworm are called

1. Scolex
2. Cysticercus
3. Proglottides
4. Onchospheres

Q. Fusion of a male gamete with egg in embryo sac is

1. Autogamy
2. Triple fusion
3. Syngamy
4. Double fertlisation

Q. Study the following statements and select the correct option.
A. Tapetum nourishes the developing pollen grains.
B. Hilum represents the junction between ovule and funicle.
C. In aquatic plants such as water hyacinth and water lily, pollination is by insects.
D. The primary endosperm nucleus is triploid.

1. A and B are correct and C and D are incorrect.
2. A, B and D are correct but C is incorrect.
3. B, C and D are correct but A is incorrect.
4. A and D are correct but B and C are incorrect.
5. All are correct

Q. In angiosperms each microspore mother cell undergoing meiosis gives rise to a ___.

1. diad
2. triad
3. tetrad
4. four diploid cells