Which of the following has proved helpful in preserving pollens as fossils?
1. | Pollen kit | 2. | Cellulosic intine |
3. | Oil content | 4. | Sporopollenin |
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 |
1. | Fusion of two male gametes of a pollen tube with two different eggs |
2. | Fusion of one male gamete with two polar nuclei |
3. | Fusion of two male gametes with one egg |
4. | Syngamy and triple fusion |
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:
1. Aloe
2. Tomato
3. Papaver
4. Michelia
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