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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Identify the plant pollinated by insects that, in many species, emit a scent of decaying flesh from the inflorescence, in order to attract insects:
1. | Yucca | 2. | Amorphophallus |
3. | Zostera | 4. | Vallisneria |
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Dioecy in flowering plants prevents:
1. Autogamy but not Geitonogamy
2. Geitonogamy but not Autogamy
3. Both Geitonogamy and Autogamy
4. Neither Geitonogamy nor Autogamy
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The correct sequence of layers in the wall of an anther from outside to inside is:
1. | Tapetum – Middle Layers – Endothecium – Epidermis |
2. | Epidermis – Endothecium – Tapetum – Middle layers |
3. | Epidermis – Endothecium – Middle layers – Tapetum |
4. | Tapetum – Endothecium – Middle layers – Epidermis |
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