Development of Female Gametophyte

Q.

With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.

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.

What is a monosporic embryo sac?

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. How many cells and nuclei are present in a mature embryo sac?

1. 8 cells, 16 nuclei
2. 7 cells, 16 nuclei
3. 7 cells, 8 nuclei
4. 8 cells, 8 nuclei

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. Both assertion and reason are false.
4. The assertion is true but reason is false.

Q.

The embryo sac of angiosperm is made up of

(a) 8 cells (b) 7 cells and 8 nuclei

(c) 8 nuclei (d) 7 cells and 7 nuclei

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. Which of the following statements is correct?

1. The polar nuclei are located in the central cell of the embryo sac.
2. Nucellus is the protective covering around the ovule.
3. Filiform apparatus is located at the chalazal end.
4. Embryo sac is located in the integuments.

Q.

What do you mean by holoblastic cleavage?

Q.

The arrangement of the nuclei in a normal embryo sac in the dicot plants is:

1. 2+4+2

2. 3+2+3

3. 2+3+3

4. 3+3+2

Q. Choose the correct statement(s).
Statement 1: In a mature embryo sac, egg apparatus is situated towards the chalazal end.
Statement 2: In a mature embryo sac, antipodal cells are situated towards the micropylar end.
Statement 3: An angiosperm embryo sac is 7-celled 8-nucleate at maturity.

1. Statement 1 only.
2. Statement 2 only.
3. Statement 3 only.
4. Statements 1, 2 and 3.

Q.

Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).

(a) Ovary ———————————

(b) Anther ———————————

(c) Egg ———————————

(d) Pollen ———————————

(e) Male gamete ———————————

(f ) Zygote ———————————

Q. Label the following

1. A - chalazal end, B - micropylar end, C - antipodal cells, D - egg, E - polar nuclei, F - Synergids
2. A - chalazal end, B - micropylar end, C - polar cells, D - polar nuclei, E -egg, F - Synergids
3. A - micropylar end, B - chalazal end, C - synergids, D - egg, E - Ovule, F - Synergids
4. A - micropylar end, B - chalazal end, C - polar nuclei, D - ovule, E - egg, F - Filiform apparatus

Q. Female gametes in the angiosperms are formed from:

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

Q. Which among the following is a pre-fertilisation event in flowering plants?

1. Gametogenesis
2. Embryogeny
3. Formation of seed
4. Formation of fruit

Q. In the dicot embryo, the cotyledons and plumule are derived from

1. hypobasal cells
2. epibasal cells
3. haustorium
4. hypophysis

Q.

Functional megaspore in an angiosperm develops into

1. ovule

2. endosperm

3. embryo sac

4. embryo

Q.

Embryo sac is to ovule as ____________ is to an anther.

1. Stamen

2. Filament

3. Pollen grain

4. Androecium

Q. What is an endosperm mother cell?

1. Mature embryo sac
2. Central cell and its two polar nuclei
3. Ovary
4. Antipodal cell and the nuclei

Q.

Filiform apparatus is the characteristic feature of which of the following options?

1. synergids

2. aleurone cell

3. nucellar embryo

4. generative cell

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. Match column 1 with column 2 and choose the correct option.
$\begin{array}{cc}\text{Column 1}& \text{Column 2}\\ \text{A. Microsporangium}& \text{i. Filiform apparatus}\\ \text{B. Chalaza}& \text{ii. Integuments}\\ \text{C. Synergids}& \text{iii. Endothecium}\\ \text{D. Megasporangium}& \text{iv. Antipodals}\end{array}$

1. A- iii, B- iv, C- i, D- ii
2. A-i, B-iii, C-iv, D-ii
3. A-ii, B-iii, C-iv, D-i
4. A-ii, B- i, C- iv, D- iii

Q. An abnormal megaspore mother cell (MMC) has double the number of chromosomes. What will be the number of nuclei in the typical embryo sac formed from the megaspore of such a megaspore mother cell?

1. 16
2. 12
3. 4
4. 8

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. 2n
3. 3n
4. 5n

Q.

Are integuments haploid or diploid?

Q. Separation of the pair of chromosomes at the time of gamete formation will

1. result in zygote formation
2. further lead to the beginning of meiosis
3. also result in segregation of a pair of factors
4. affect zygote formation

Q.

In the life cycle of angiosperms, free nuclear divisions occur during the development of

1. Embryo

2. Endosperm

3. Both B & C

4. Embryo Sac

Q. Assertion : Somatic embryos can be induced from any cell in plant tissue culture.

Reason : Any living plant cell is capable of differentiating into somatic embryos.

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

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