- 1(current)
Q. No.In an angiosperm, the structure that develops and becomes a pollen sac is called:
| 1. | Megasporophyll | 2. | Megasporangium |
| 3. | Microsporangium | 4. | Microsporophyll |
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A typical angiosperm anther is:
1. Bilobed and polythecous
2. Unilobed and monothecous
3. Multilobed and monothecous
4. Bilobed and dithecous
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The layers in the walls of the microsporangium that helps in the dehiscence of anther to release the pollen include:
| I. | Epidermis |
| II. | Endothecium |
| III. | Middle layers |
| IV. | Tapetum |
| 1. | I and II only | 2. | I, II, and III only |
| 3. | II and III only | 4. | I, II, III, and IV |
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| A | B | C | D | |
| 1. | Epidermis | Endothecium | Middle layers | Tapetum |
| 2. | Epithelium | Endothelium | Middle layers | Tapetum |
| 3. | Endothecium | Epidermis | Tapetum | Middle layers |
| 4. | Epithelium | Endothelium | Tapetum | Middle layers |
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| Statement I: | This process is coordinated precisely with pollen differentiation, floral development, and flower opening. |
| Statement II: | Anther dehiscence is the final function of the anther that causes the release of pollen grains. |
| 1. | Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I. |
| 2. | Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I. |
| 3. | Statement I is true but Statement II is false. |
| 4. | Statement I is false but Statement II is true. |
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The outer hard layer of the pollen wall is made up of:
| 1. | Callose, which is easily digested by enzymes |
| 2. | Sporopollenin, which is resistant to all enzymes |
| 3. | Hemicellulose, which is difficult to digest by enzymes |
| 4. | Calcium pectate, which is easily digested by enzymes |
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What is true about the vegetative cell in the pollen tube?
| 1. | It is smaller than the generative cell |
| 2. | It has an irregular shaped nucleus |
| 3. | It floats in the cytoplasm of the generative cell |
| 4. | It has a dense cytoplasm lacking food reserves |
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At what temperature pollens can be stored for years in liquid nitrogen?
| 1. | 0°C | 2. | -100°C |
| 3. | -196°C | 4. | 4°C |
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- 1(current)
Q. No.
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