Q. No.
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
| 1. | Cuticle | 2. | Sporopollenin |
| 3. | Lignin | 4. | Cellulose |
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The gynoecium consists of many free pistils in flowers of
1. Aloe
2. Tomato
3. Papaver
4. Michelia
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Even in absence of pollinating agents, seed setting is assured in:
| 1. | Commelina | 2. | Zostera |
| 3. | Salvia | 4. | Fig |
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Which one of the following statements is wrong?
| 1. | When pollen is shed at two-celled stage, double fertilization does not take place. |
| 2. | Vegetative cell is larger than generative cell. |
| 3. | Pollen grains in some plants remain viable for months. |
| 4. | Intine is made up of cellulose and pectin. |
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Plants with ovaries having only one or a few ovules, are generally pollinated by:
1. Bees
2. Butterflies
3. Birds
4. Wind
What is the function of germ pore?
1. Emergence of radicle
2. Absorption of water for seed germination
3. Initiation of pollen tube
4. Release of male gametes
Perisperm differs from endosperm in:
| 1. | having no reserved food. |
| 2. | being a diploid tissue. |
| 3. | its formation by fusion of a secondary nucleus with several sperms. |
| 4. | being a haploid tissue. |
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