Q. No.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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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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Majority of the flowering plants produce:
| 1. | Female flowers | 2. | Male flowers |
| 3. | Hermaphroditic flowers | 4. | Neutral flowers |
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In artificial hybridization experiments, if the female plant produces unisexual flowers, emasculation:
1. Must be done before maturity.
2. Must be done after maturity.
3. Must be done at maturity.
4. Is not needed.
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The germ pore in the pollen wall:
| 1. | is an aperture in the pollen intine that allows the pollen tube to exit. |
| 2. | is the name of the nucleus of the microspore mother cell. |
| 3. | is formed where sporopollenin is located in the exine. |
| 4. | is an aperture in the pollen exine that allows the pollen tube to exit. |
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Which of the following is not used by flowering plants as an outbreeding device?
| 1. | Lack of synchronization between pollen release and stigma receptivity. |
| 2. | Anther and Stigma placed at different levels. |
| 3. | Self-incompatibility. |
| 4. | Production of bisexual flowers. |
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The pollen tube releases the two male gametes first into:
1. The vicinity of the egg cell.
2. The vicinity of polar nuclei.
3. In the cytoplasm of synergids.
4. In the cytoplasm of antipodals.
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Filiform apparatus is associated with _____ and helps in _____________.
1. Syngergids; Nourishment of egg cells
2. Synergids; Guiding the pollen tube
3. Antipodals; Nourishment of egg cells
4. Antipodals; Guiding the pollen tube
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