In typical angiosperms, the mature embryo sac has A antipodal cells, B Polar nuclei and C egg cell
Select the correct option to fill in the blanks.
1. A - three, B - two, C - one
2. A - two, B - two, C - one
3. A - three, B - one, C - one
4. A - two, B - three, C - one
Subtopic: Â Pistil: Ovule |
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From NCERT
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For a typical angiospermic anther, which of the following terms is not used?
1. Integumented
2. Bilobed
3. Dithecous
4. Tetrasporangiate
1. Integumented
2. Bilobed
3. Dithecous
4. Tetrasporangiate
Subtopic: Â Stamen: Anther |Â Pistil: Ovule |
 86%
From NCERT
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Read the following features of flowers in a plant and select the agent for pollination accordingly.
A. Sticky pollen grains.
B. Colorful flowers.
C. Flower with pleasant odour and nectar.
1. Wind
2. Water
3. Insects
4. Earthworm
A. Sticky pollen grains.
B. Colorful flowers.
C. Flower with pleasant odour and nectar.
1. Wind
2. Water
3. Insects
4. Earthworm
Subtopic: Â Pollination & Outbreeding Devices |
 93%
From NCERT
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Which structure in stamen develops into pollen sac?
1. Stalk
2. Endothecium
3. Sporogenous tissue
4. Microsporangium
1. Stalk
2. Endothecium
3. Sporogenous tissue
4. Microsporangium
Subtopic: Â Stamen: Microsporangium |
 74%
From NCERT
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Triploid primary endosperm nucleus is formed when
| 1. | Syngamy occurs during double fertilization. |
| 2. | Male gamete fuses with only one polar nuclei located in central cell |
| 3. | Male gamete fuses with two polar nuclei located in central cell |
| 4. | Male gamete fuses with two polar nuclei located in antipodal cells |
Subtopic: Â Double Fertilization |
 87%
From NCERT
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Cells of tapetum generally have more than one nucleus. This condition in the cells is developed due to
| 1. | Plasmogamy not followed by karyogamy |
| 2. | Failure of cytoplasmic division after nuclear division |
| 3. | Failure of the separation of daughter chromosomes during cell division |
| 4. | Migration of nuclei in a cell from neighbouring cells |
Subtopic: Â Pistil: Ovule |
 65%
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Select the incorrect statement regarding embryo-sacs in angiosperms.
1. They are highly reduced female gametophytes
2. Each have three-called egg apparatus
3. Each cell of an embryo-sac is diploid
4. Its formation is preceded by meiosis
1. They are highly reduced female gametophytes
2. Each have three-called egg apparatus
3. Each cell of an embryo-sac is diploid
4. Its formation is preceded by meiosis
Subtopic: Â Pistil: Ovule |
 72%
From NCERT
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In flowering plants, microspores are
1. Male gametes
2. Pollen grains
3. Pollen mother cells
4. Generative grains
1. Male gametes
2. Pollen grains
3. Pollen mother cells
4. Generative grains
Subtopic: Â Stamen: Male Gametophyte |
 64%
From NCERT
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Number of haploid nuclei formed by the smaller cell of the pollen grain is
1. Four
2. Three
3. Two
4. Seven
1. Four
2. Three
3. Two
4. Seven
Subtopic: Â Stamen: Microsporangium |
 68%
From NCERT
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Select the incorrect statement regarding the viability periods of pollen grains.
| 1. | It depends upon the chromosome number of a species |
| 2. | In some cerials the viability is lost within 30 minutes |
| 3. | Viability of pollen grains can be increased by storing them at very low temperature |
| 4. | In some leguminous plants, pollen grains maintain viability for months' |
Subtopic: Â Stamen: Male Gametophyte |
 80%
From NCERT
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