Q. No.
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Nucellar polyembryony is reported in which of the following species?
1. Citrus
2. Gossypium
3. Triticum
4. Brassica
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In which one of the following pollination is autogamous
1. Geitonogamy
2. Xenogamy
3. Chasmogamy
4. Cleistogamy
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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
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