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Q. No.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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Identify the incorrect statement regarding water-pollinated flowers:
| 1. | Pollination by water is rare and is seen in monocotyledons mostly |
| 2. | Pollen grains in most are covered by a mucilaginous covering |
| 3. | Produce nectar |
| 4. | Are not very colourful |
Subtopic: Pollination & Outbreeding Devices |
86%
From NCERT
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Subtopic: Pollination & Outbreeding Devices |
93%
From NCERT
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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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The outer hard layer of the pollen wall is made up of:
| 1. | Callose, which is easily digested by enzymes |
| 2. | Sporopollenin, which is resistant to all enzymes |
| 3. | Hemicellulose, which is difficult to digest by enzymes |
| 4. | Calcium pectate, which is easily digested by enzymes |
Subtopic: Stamen: Microsporangium |
96%
From NCERT
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In over 60 % of angiosperms, pollen grains are shed at:
| 1. | 2-celled stage | 2. | 3-celled stage |
| 3. | 4-celled stage | 4. | 1-celled stage |
Subtopic: Stamen: Male Gametophyte |
88%
From NCERT
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The body of the ovule fuses with the funicle in the region called:
| 1. | Chalaza |
| 2. | Micropyle |
| 3. | Hilum |
| 4. | Nucellus |
Subtopic: Pistil: Ovule |
90%
From NCERT
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Division of functional megaspore can be described as:
| 1. | Three free nuclear mitotic divisions. |
| 2. | One meiotic and two mitotic divisions, all free nuclear. |
| 3. | Three cytoplasmic mitotic divisions. |
| 4. | One meiotic and two mitotic divisions, meiotic being cytoplasmic and mitotic being free nuclear. |
Subtopic: Pistil: Ovule |
63%
From NCERT
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Transfer of pollens from the anther to the stigma of the same flower is called:
| 1. | Autogamy | 2. | Geitonogamy |
| 3. | Xenogamy | 4. | Cleistogamy |
Subtopic: Pollination & Outbreeding Devices |
91%
From NCERT
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