Q. No.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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A typical angiosperm anther is:
1. Bilobed and polythecous
2. Unilobed and monothecous
3. Multilobed and monothecous
4. Bilobed and dithecous
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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 |
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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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Which of the following is/are a marine plant pollinated by water?
| 1. | Vallisneria | 2. | Hydrilla |
| 3. | Zostera | 4. | Both 1 and 2 |
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In angiosperms, triple fusion results in the formation of:
| 1. | Zygote | 2. | Endosperm |
| 3. | Nucellus | 4. | PEC |
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Identify the incorrect statement regarding Parthenium hysterophorus:
| 1. | Its pollens are a very common cause of severe respiratory allergies. |
| 2. | It was introduced in India accidentally as a contaminant in wheat. |
| 3. | It is a native of tropical America |
| 4. | It is non-invasive and limited to certain pockets in India only |
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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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The only type of pollination which during pollination brings a genetically different type of pollen grains to the stigma is:
| 1. | Chasmogamy | 2. | Cleistogamy |
| 3. | Geitonogamy | 4. | Xenogamy |
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