Double Fertilization

Q.

Does dehiscence of anther occur longitudinally or transversely?

Q.

Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the questions that follow :
(a) Name the parts labelled 1, 2, 3, 4, 5 and 6.
(b) What happens to (i) Ovary (ii) Ovule after fertilization ?

(c) What is the function of the synergids?
(d) What part does the stigma play in the process of fertilization?

Q.

Describe the mechanism of fertilization in plants.

Q.

The process of fusion of the male and female gametes in plants is___

Q.

Assertion: The largest cell of the embryo sac is the central cell.

Reason: It consists of a fused nuclei.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

3. If the assertion is true but the reason is false

4. If both the assertion and reason are false

Q.

The fusion of male and female gametes to produce zygote

Q.

The double fertilization leads to the formation of

1. Embryo

2. Ovules

3. Pollens

4. Endosperm

Q.

Which of the following correctly describes triple fusion?

1. Fusion two polar nuclei with an egg.

2. None of the above.

3. Fusion of two polar nuclei with one male gamete.

4. Fusion two female gamete with one male gamete

Q.

Give a one word for following:

Fusion of male and female gametes.

Q.

Where does the actual fertilizations occur?

Q. Assertion :Synergids play an important role in directing the pollen tube growth. Reason: Because synergids secrete some chemotropically active substance.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q. Subsequent to fertilization an egg of Ascaris undergoes to profound changes, which involve

1. Migration of glycogenic globules to the surface and formation of lipid layer, below the shell
2. Formation of thick and chitinous shell
3. Receiving a coat of albuminous material via the secretions elaborated by uterine cells
4. All of the above

Q. Micropyle is an opening for entry of ......................

1. Pollen tube
2. Style
3. Stamoid corona
   
4. None of the above

Q. What will happen to the style after fertilisation in flower ? In some cases Style do not fall after fertilsation in flower than give the examples. (NO LINKS).

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.

The number of nuclei involved in double fertilisation are

1. 5

2. 2

3. 4

4. 3

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

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

Q.

Identify the labelled parts in the given figure

1. (i)- Synergids, (ii)- Central cell, (iii)- Vacuole, (iv)- Egg cell, (v)- Antipodals

2. (i)- Antipodals, (ii)- Polar nuclei, (iii)- Central cell, (iv)- Egg cell, (v)- Synergids

3. (i)- Vegetative cells, (ii)- Secondary nucleus, (iii)- Egg cell, (iv)- Synergid, (v)- Filiform apparatus

4. (i)- Anterior cells, (ii)- Central cell, (iii)- Secondary nucleus, (iv)- Female gamete, (v)- Accessory cells

Q. Filiform apparatus is a characteristic feature of :

1. Zygote
2. Suspensor
3. Egg
4. Synergid

Q.

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

1. Development of female gametophyte

2. Microsprogenesis

3. Megasporogenesis

4. All of the above

Q.

The number of chromosomes involved in double fertilisation of a maize plant are = ?
Given that the diploid chromosome number of maize is 20.

1. 100

2. 40

3. 80

4. 50

Q. Fill in the blanks with appropriate words.
The two types of nuclei in Paramecium are the .........., which controls normal cellular metabolism, and the .........., which is involved in reproduction.

Q. In the gonad for the multiplication of undifferentiated germ cells mitosis occur what does this mean?

Q. Match the pairs

1. Triploid
2. Ovary walls
3. Ovule
4. Fruits
5. Endosperms
6. Zygote
7. Seeds
8. Synergids
9. Diploid
10. Haploid

Q.

Which of the following correctly describes triple fusion?

1. Fusion of two polar nuclei with one male gamete.

2. Fusion of two polar nuclei with an egg.

3. Fusion of two female gamete with one male gamete

4. None of the above.

Q.

The pollen tube usually enters the embryo sac

1. Between one synergid and central cell.

2. By knocking off the antipodal cells.
   

3. By directly penetrating the egg.

4. Through one of the synergids.