Double Fertilisation

Q.

What is the ploidy of nucellus, MMC, functional megaspore, and female gametophyte?

Q.

In an angiosperm, a functional megaspore develops into an

1. Embryo sac

2. Endosperm

3. Ovule

4. Embryo

Q.

Triple fusion in angiosperms involves which phenomenon of fusion?

Q.

The embryo sac in most angiosperms is made up of:

1. 8 cells

2. 7 cells and 8 nuclei

3. many cells

4. 7 cells and 7 nuclei

Q.

Define triple fusion. What is the product of this process? What does the product develop into?

Q. Which of the following parts of the mature embryo sac start to degenerate after double fertilization?

I) Polar nuclei
II) Antipodal cells
III) Synergids
IV) Central cell

1. I and III
2. II, III, and IV
3. I, IV and II
4. II and III

Q. The embryo sac in angiosperms is _________ celled and ________ nucleated structure.

1. seven and eight
2. eight and seven
3. four and five
4. two and three

Q. After double fertilisation, the new products in the mature ovule are:

1. 1 diploid cell and 1 haploid cell
2. 1 diploid cell and 1 triploid cell
3. 2 diploid cells and 1 haploid cell
4. 2 diploid cells and 1 triploid cell

Q. After double fertilisation, __________ degenerate, ________ forms into an embryo, _________ forms endosperm.

1. synergids, zygote, secondary nucleus
2. antipodals, zygote, PEN
3. antipodals, endosperm, embryo
4. antipodals, PEN, zygote

Q. If a diploid species has a primary spermatocyte containing 60 chromosomes, what shall be the number of chromatids in each of the secondary spermatocyte produced after the completion of meiosis I?

1. 60
2. 30
3. 15
4. 120

Q. The total number of nuclei involved during double fertilisation are:

1. 2
2. 4
3. 5
4. 3

Q.

The ploidy of (i) male gamete, (ii) zygote, (iii) egg cell, (iv) polar nuclei and (v) PEN is

1. (i)- n, (ii)-2n, (iii)-n, (iv)-2n, (v)- 3n

2. (i)-n, (ii)-2n, (iii)-4n, (iv)-3n, (v)- 2n

3. (i)-2n, (ii)-n, (iii)-3n, (iv)-n , (v)- 2n

4. (i)-n, (ii)-2n, (iii)-3n, (iv)-n , (v)- n

Q.

Double fertilization

1. forms embyo only

2. forms endosperm only

3. is a characteristic feature of flowering plants

4. involves five nuclei

Q. What is the fate of ovary and ovulation after fertilisation in plants ?

Q. The set belonging to gametophytic generation of Pinus is

1. Ovuliferous scale, bract scale and embryo
2. Endosperm; sperms; megaspores
3. Pollen; embryo; endosperm
4. Integument, prothallial cells of pollen; bract scales

Q. During double fertilization, one male gamete fuses with egg and the other male gamete fuses with the ___________.

1. antipodals
2. secondary nucleus
3. synergids
4. PEN

Q. A total of nuclei are involved in double fertilisation.

1. two
2. three
3. four
4. five

Q. Endosperm of seed develops from

1. haploid nucleus
2. triploid nucleus
3. diploid nucleus
4. polyploidy nucleus

Q.

Three features which distinguish angiosperms are:

1. Naked seeds, flowers, double fertilization

2. Double fertilization, covered seeds, flowers

3. Dominant gametophyte, covered seeds, flowers

4. Dominant sporophytes, naked seeds, double fertilization

Q. Double fertilisation is a unique event to

1. bryophytes
2. pteridophytes
3. gymnosperms
4. angiosperms

Q.

The embryo sac of angiosperms is made up of_____

1. 8 cells with 7 nuclei

2. 8 cells with 8 nuclei

3. 7 cells with 6 nuclei

4. 7 nuclei with 7 nuclei

Q. The wing of the seed of pinus develops from

1. Inner layer of the integument and basal part of the ovuliferous scale
2. Outer layer of the integument and basal part of the ovuliferous scale
3. Only from outer layer of the integument
4. From ovuliferous scale

Q.

The number of nuclei involved in double fertilisation are

1. 4

2. 5

3. 2

4. 3

Q.

The seeds of angiosperms contain reserve food material termed ________.

1. Perisperm

2. Nucellus

3. Pericarp

4. Endosperm

Q. The phenomenon of double fertilization

1. involves the formation of an embryo only
2. involves the formation of an endosperm only
3. is a characteristic feature of gymnosperms
4. involves five nuclei

Q. Label the following:

1. A - degenerating antipodal cells, B - zygote, C - PEC, D - PEN, E - degenerating synergids
2. A - degenerating synergids, B - endosperm, C - zygote, D - nucleus, E - degenerating antipodal cells
3. A - degenerating synergids, B - zygote, C - primary endosperm cell, D - primary endosperm nucleus, E - degenerating antipodal cells
4. A - degenerating antipodal cells, B - egg, C - central cell, D - polar nuclei, E - degenerating synergids

Q.

The seeds of angiosperms contain reserve food material termed ________.

1. Perisperm

2. Endosperm

3. Nucellus

4. Pericarp

Q. What is the fate of the male gametes discharged in the synergid?

1. One fuses with the egg and other fuses with central cell nuclei
2. One fuses with the egg, other(s) degenerate in the synergid
3. All fuse with the egg
4. One fuses with the egg, other(s) fuse(s) with synergid nucleus

Q. Fertilisation leading to the formation of endosperm refers to

1. fusion of male gamete with diploid secondary nucleus
2. fusion of female gamete with diploid secondary nucleus
3. fusion of two diploid vegetative cells
4. fusion of two male gametes

Q. Assertion: In angiosperms, each of the cells of an embryo-sac is haploid.
Reason: Embryo sac formation is preceded by meiosis.

1. Both A and R are correct and R is the correct explanation of A.
2. Both A and R are correct and R is not the correct explanation of A.
3. A is correct but R is incorrect.
4. Both A and R are incorrect