Development of Female Gametophyte

Q. Megagametogenesis is the process of

1. formation of female gametophyte from the precursor cell
2. formation of megaspore from the megaspore mother cell
3. formation of female gametophyte from the megaspore mother cell
4. formation of female gametophyte from the megaspore

Q.

What does the filiform apparatus do at the entrance or Function of the filiform apparatus is to

1. It helps in the entry of pollen tube into a synergid

2. It prevents entry of more than one pollen tube into the embryo sac

3. It brings about opening of the pollen tube

4. It guides pollen tube from a synergid to egg

Q.

What is the correct sequence of the formation of female gametophyte in angiosperms?

1. Nucellus, megaspore tetrad, megaspore mother cell, megaspore, female gametophyte

2. Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte

3. Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte

4. Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametohyte

Q. With respect to angiosperms, identify the correct option.

1. Antipodals – n
2. Vegetative cell of male gametophyte –2n
3. Primary endosperm nucleus – n
4. Cells of nucellus of ovule – n

Q. After the __ - nucleate stage, cell walls are laid down leading to the organization of the typical female gametophyte or _____________.

1. 8, megaspore
2. 4, megaspore mother cell
3. 8, embryo sac
4. 8, megasporangium

Q. A mature haploid female gametophyte has

1. 8 cells and 7 nuclei
2. 7 cells and 8 nuclei
3. 7 cells and 6 nuclei
4. 6 cells and 7 nuclei

Q. Female gametes in the angiosperms are formed from:

1. megaspore mother cell
2. somatic cell
3. megaspore
4. ovule

Q. What is monosporic development?

1. The method of formation of an embryo sac from a single megaspore
2. The method of formation of megaspores from a single megaspore mother cell.
3. The method of formation of microspores from a single pollen mother cell
4. The method of formation of single seed from a single ovule.

Q. The nucleus of the megaspore divides _________ to form two nuclei. The binucleate embryo sac then undergoes _________ to form 4 nucleate embryo sac.

1. meiotically, mitosis
2. mitotically, meiosis
3. meiotically, meiosis
4. mitotically, mitosis

Q. If a diploid egg cell fuses with the male gamete produced by a diploid male plant, then what will be the ploidy of the resulting embryo?

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

Q. What is the function of the filiform apparatus?

1. To give rise to the seed
2. To guide the pollen tube into the synergids
3. To guide the pollen tube into the antipodals
4. All of the above

Q. Functional megaspore in an angiosperm develops into:

1. Ovule
2. Endosperm
3. Embryo sac
4. Embryo

Q. Assertion: A typical angiosperm embryo sac is 8-nucleate and 7-celled.
Reason: The large central cell of embryo sac has three polar nuclei.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. The assertion is true but reason is false.
4. Both assertion and reason are false.

Q.

Functional megaspore in an angiosperm develops into

1. endosperm

2. embryo sac

3. embryo

4. ovule

Q. Which of the following options has only diploid structures with respect to flowering plants?

1. MMC, microspore, endosperm
2. Zygote, central cell, nucellus
3. Polar nuclei, PMC, PEN
4. MMC, integuments, endosperm

Q.

The ratio between the number of male gametes produced by pollen grain and the female gametes produced by embryo sac is -

1. 1 : 2

2. 2 : 3

3. 3 : 7

4. 2 : 1

Q. Female gametes in the angiosperms are formed from:

1. megaspore mother cell
2. somatic cell
3. megaspore
4. ovule

Q. A typical angiosperm embryo sac at maturity is

1. 4 nucleate – 2 celled
2. 8 nucleate – 7 celled
3. 4 nucleate – 4 celled
4. 8 nucleate – 4 celled

Q. Synergids are ___.

1. haploid
2. diploid
3. triploid
4. tetraploid

Q. Which of the following structures are found in the ovule even before the megaspore is formed?
I) Nucellus
II) Egg cell
III) Funicle
IV) Polar nuclei

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

Q. After the __ - nucleate stage, cell walls are laid down leading to the organization of the typical female gametophyte or _____________.

1. 8, megaspore
2. 4, megaspore mother cell
3. 8, embryo sac
4. 8, megasporangium

Q. Identify the female gamete of an angiosperm.

1. 
2. 
3. 
4. 
5. 

Q.

The arrangement of (i) cells and (ii) nuclei in a typical embryo sac is -

1. (i)(3 + 1 + 3) & (ii)(3 + 2 + 3)

2. (i)(3 + 2 + 3) & (ii)(3 + 1 + 3)

3. (i)(3 + 1 + 3) & (ii)(3 + 1 + 3)

4. (i)(3 + 2 + 3) & (ii)(3 + 2 + 3)

Q. Match column - I with column - II and select the correct option.

Column- I	Column - II
A. Funicle	(i) Mass of parenchymatous cells
B. Hilum	(ii) Basal part of ovule
C. Integument	(iii) One or two protective layers of ovule
D. Chalaza	(iv) Region where the body of ovule fuses with funicle
E. Nucellus	(v) Stalk of ovule

1. A-(i), B-(iii), C-(v), D-(ii), E-(iv)
2. A-(i), B-(ii), C-(iii), D-(iv), E-(v)
3. A-(v), B-(iv), C-(ii), D-(ii), E-(iii)
4. A-(v), B-(iv), C-(iii), D-(ii), E-(i)

Q.

The number of (i) meiotic and (ii) mitotic divisions required for the development of 7-celled, 8-nucleate monosporic embryo sac are

1. (i) 1 & (ii) 3

2. (i) 4 & (ii) 3

3. (i) 2 & (ii) 3

4. (i) 1 & (ii) 7