Pollen grains can be stored for several years in liquid nitrogen having a temperature of:

1.	–120 °C	2.	–80 °C
3.	–196 °C	4.	–160 °C

Double fertilization is exhibited by:

1. Algae

2. Fungi

3. Angiosperms

4. Gymnosperms

Arrange the following stages of microspore development into pollen grain, in correct sequence

1. b, c, d, and a 

2. b, d, a and c

3. a, c, b and d 

4. b, a, d and c

Advantage of cleistogamy is:

1. More vigorous offspring

2. No dependence of pollinator

3. Vivipary

4. Higher genetic variability

The gynoecium consists of many free pistils in flowers of:

From the statements given below choose the option that are not true for a typical female gametophyte of a flowering plant:

(i) It is 8-nucleate and 7-celled at maturity

(ii) It is cellular during the development

(iii) It is situated inside the nucellus

(iv) It has an egg apparatus situated at the chalazal end

1. i and iv

2. ii and iii

3. i and ii

4. ii and iv

The mature seeds of plants such as gram and peas, posses no endosperm, because

1. These plants are not angiosperms

2. There is no double fertilization in them

3. Endosperm is not formed in them

4. Endosperm gets used up by the developing embryo during seed development

Match the following and choose correct option
          Group A                        Group B
A. Aleurone layer               i. without fertilization

B. Parthenocarpic fruit       ii. Nutrition fruit

C. Ovule                           iii. Double fertilization

D. Endosperm                   iv. Seed

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

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

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

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

Following are four statements find out correct statements

(i) Microsporangia has four layers, outer three are protective and inner one is nutritive

(ii) Each cell of sporogenous tissue within micorsporangia is capable of giving raise to a microspore tetrad.

(iii) Dehydration of anther is important for seperation of pollen grains in a tetrad.

(iv) Generative cell in pollen grain is small with respect to vegetative cell and it floats in cytoplasm of vegetative cell.

Options

1. All are correct

2. Only (i), (ii) and (iii) is correct

3. Except (ii) all are correct

4. Expect (iii) all are correct.