Structure of Ovule

Q.

What is meant by monosporic development of female gametophyte?

Q.

A typical angiosperm embryo sac at maturity is:

1. 7-nucleate and 8-celled

2. 8-nucleate and 7-celled

3. 7-nucleate and 7-celled

4. 8-nucleate and 8-celled

Q.

The three cells present at the end opposite to the micropyle are called ________.

1. Embryo sac cells

2. Synergid cells

3. Egg cells

4. Antipodal cells

Q.

Which one of the following statements is wrong regarding pollen grains?

1. Vegetative cell is larger than generative cell

2. When pollen is shed at the two-­celled stage, double fertilization does not take place

3. Intine is made up of cellulose and pectin

4. Pollen grains in some plants remain viable for months

Q.

Draw a neat labeled diagram of a mature anatropous ovule before fertilization.

Q.

What happens to the zygote formed after fertilization?

Q.

What is the role of pollen grains in plant reproduction?

Q. Image of transverse section of dicot stem is given below.


Which part labelled has the special organs that carry out photosynthesis?

1. A
2. B
3. C
4. D

Q.

What is the difference between blastomere and morula?

Q. Marsilea belongs to which of the following division?

1. Thallophyta
2. Bryophyta
3. Pteridophyta
4. None of the above

Q.

What is a megagametophyte?

Q.

Differentiate between fruit and seed.

Q.

Megasporangium is a technical name for ___

1. Nucellus

2. Ovule

3. Embryo sac

4. Fruit

Q.

An ovule that becomes curved so that the nucellus and embryo sac lies at right angles to the funicle is-

1. campylotropous

2. hemitropous

3. orthotropous

4. anatropous

Q.

Where does the germination of the pollen grains take place and how?

Q. Integuments have a small opening called as the which allows the entry of pollen grain.

1. nucellus
2. micropyle
3. funicle

Q.

What is delayed karyogamy?

Q.

Identify the correct sequence of cells formed during embryo sac development.

1. Megaspore mother cell - Megaspore tetrad - Embryo Sac- Nucellus

2. Megaspore mother cell - Megaspore tetrad - Functional megaspore - Embryo Sac

3. Sporogenous cell - Megaspore tetrad- Megaspore mother cell - Embryo Sac

4. Nucellus - Sporogenous cell - Embryo Sac - Megaspore-Megaspore mother cell

Q.

What is the fate of the cluster of cells in the blastocyst known as the inner cell mass?

Q. Select the correct statement(s) regarding the structure of a mature embryo sac.
(i) Egg apparatus is situated towards chalazal end.
(ii) Antipodal cells are situated towards micropylar end.
(iii) a typical angiospermic embryo sac is $7$-celled, $8$ nucleate at maturity.

1. (i) only
2. (ii) only
3. (iii) only
4. (i), (ii) and (iii)

Q.

A fruit does not protect the seed.

1. True
2. False

Q. What is the direction of micropyle in anatropous ovule?

1. Left
2. Right
3. Inverted
4. Upward

Q. Megasporangium is equivalent to

1. Embryo sac
2. Fruit
3. Nucellus
4. Ovule

Q. A typical gynoecium consists of which of the following parts?

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

Q. Which of the following is an example of pteridophyta?

1. Anthoceros
2. Sargassum
3. Lycopodium
4. Funaria

Q. The characteristic of anatropous ovule is?

1. Occurrence of hilum near the micropyl
2. Presence of raphe
3. All the above
4. Inversion $\left({180}^o\right)$ over the funicle

Q. When micropyle, chalaza and hilum lie in a straight line, the ovule is said to be.

1. Anatropous
2. Orthotropous
3. Amphitropous
4. Campylotropous

Q. The microspore or male gamete formation involves meiosis. True or false?

1. True
2. False

Q. A mass of parenchymatous tissue forming the bulk of ovule is

1. Obturator
2. Nucellus
3. Female gametophyte
4. Endosperm

Q.

What is the stratum corneum?