Q. No.A dioecious flowering plant prevents both:
1.
Autogamy and xenogamy
2.
Autogamy and geitonogamy
3.
Geitonogamy and xenogamy
4.
Cleistogamy and xenogamy
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Attractants and rewards are required for:
1. Anemophily
2. Entomophily
3. Hydrophily
4. Cleistogamy
Cultivation of flowering and ornamental plants for gardens and for commerce and trade is called:
| 1. | Horticulture | 2. | Plant breeding |
| 3. | Floriculture | 4. | Micropropagation |
Tapetum :
| I. | Is a layer of nutritive cells that are found within the microsporangium. |
| II. | The cells are usually bigger and normally have more than one nucleus per cell because mitosis is not normal in them. |
| III. | Helps in pollen wall formation, transportation of nutrients to the inner side of the anther, synthesis of callose enzyme for separation of microspore tetrads. |
Of the above statements, the correct ones are:
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Pollen grains lose viability within 30 minutes of their release in some members of:
| 1. | Rosaceae | 2. | Leguminosae |
| 3. | Poaceae | 4. | Solanaceae |
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Consider the following two statements regarding the integuments of an ovule:
| I: | Angiosperms are generally bitegmic and gymnosperms unitegmic |
| II: | The integuments develop into the seed coat when the ovule matures after fertilization. |
Of the two statements:
1. Both I and II are true
2. Both I and II are false
3. Only I is true
4. Only II is true
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How many cells of the female gametophyte are surrounded by a cell wall and are organized into cells?
| 1. | 6 | 2. | 7 |
| 3. | 8 | 4. | 2 |
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Cleistogamous flowers are:
| 1. | Mostly autogamous | 2. | Invariably autogamous |
| 3. | Mostly xenogamous | 4. | Invariably xenogamous |
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Which of the following is not a character of anemophilous flowers?
1. Pollens are light and non sticky
2. Stamens are well exposed
3. Have large, often feathery stigma
4. Have multiple ovules in each ovary
The majority of water plants like water hyacinth and water lily are pollinated by:
| 1. | Water | 2. | Wind |
| 3. | Insects | 4. | Both 2 and 3 |
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