Q. No.Pollen grains lose viability within 30 minutes of their release in some members of:
1. Rosaceae 2. Leguminosae 3. Poaceae 4. Solanaceae
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 |
At what temperature pollens can be stored for years in liquid nitrogen?
| 1. | 0°C | 2. | -100°C |
| 3. | -196°C | 4. | 4°C |
In angiosperms, the mature female gametophyte is represented by:
| 1. | Nucellus | 2. | Megaspore |
| 3. | MMC | 4. | Embryosac |
A typical angiosperm embryosac, at maturity, is:
| 1. | 8 celled and 8 nucleate | 2. | 8 celled and 7 nucleate |
| 3. | 7 celled and 8 nucleate | 4. | 7 celled and 7 nucleate |
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. |
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.
A typical angiosperm anther is:
1. Bilobed and polythecous
2. Unilobed and monothecous
3. Multilobed and monothecous
4. Bilobed and dithecous
When the embryosac develops from a single functional megaspore [the other three get generate], it is called as:
| 1. | Monosporic | 2. | Bisporic |
| 3. | Trisporic | 4. | Tetrasporic |
Geitonogamy is:
| 1. | Functionally cross–pollination but genetically autogamy |
| 2. | Functionally autogamy but genetically cross-pollination |
| 3. | Functionally and genetically autogamy |
| 4. | Functionally and genetically cross-pollination |
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