Q. No.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 |
In the majority of angiosperms:
| 1. | egg has a filiform apparatus |
| 2. | there are numerous antipodal cells |
| 3. | reduction division occurs in the megaspore mother cells |
| 4. | a small central cell is present in the embryo sac |
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
| 1. | Hydrilla | 2. | Yucca |
| 3. | Banana | 4. | Viola |
The ovule of an angiosperm is technically equivalent to:
1. megasporangium
2. megasporophyll
3. megaspore mother cell
4. megaspore
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by:
1. Bee
2. Wind
3. Bat
4. Water
A dioecious flowering plant prevents both:
1. Autogamy and geitonogamy
2. Geitonogamy and xenogamy
3. Cleistogamy and xenogamy
4. Autogamy and xenogamy
| 1. | Exine of pollen grains is made up of sporopollenin |
| 2. | Pollen grains of many species cause severe allergies |
| 3. | Stored pollen in liquid nitrogen can be used in crop breeding programs |
| 4. | Tapetum helps in the dehiscence of anther |
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