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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Identify the incorrectly matched pair:
Cell | Ploidy | |
1. | Cells of nucellus | Diploid |
2. | Megaspore mother cell | Haploid |
3. | Functional megaspore | Haploid |
4. | Cells of female gametophyte | haploid |
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In angiosperms:
1. Pollen grains are motile but the egg cell is non-motile.
2. Pollen grains are non-motile but the egg cell is motile.
3. Both pollen grain and egg cell are non-motile.
4. Both pollen grain and egg cell are motile.
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