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Q. No.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
Subtopic: Pistil: Ovule |
92%
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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 |
Subtopic: Pollination & Outbreeding Devices |
89%
From NCERT
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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 |
Subtopic: Pollination & Outbreeding Devices |
62%
From NCERT
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In angiosperms, triple fusion results in the formation of:
| 1. | Zygote | 2. | Endosperm |
| 3. | Nucellus | 4. | PEC |
Subtopic: Double Fertilization |
From NCERT
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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 |
Subtopic: Stamen: Male Gametophyte |
78%
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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 |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
84%
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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 |
Subtopic: Pollination & Outbreeding Devices |
92%
From NCERT
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Subtopic: Pollination & Outbreeding Devices |
92%
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Whether a pollen grain will be able to germinate on a stigma is primarily decided by:
| 1. | The stage at which the pollen is shed |
| 2. | Recognition by the stigma |
| 3. | Maturity of the egg cell in the embryosac |
| 4. | Environmental conditions |
Subtopic: Pollination & Outbreeding Devices |
84%
From NCERT
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Syngamy in angiosperms results in the formation of:
| 1. | A haploid cell | 2. | A diploid cell |
| 3. | A triploid cell | 4. | A polyploid cell |
Subtopic: Double Fertilization |
87%
From NCERT
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