Study the given figure and select the correct statements:
I:
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage.
II:
In 40 per cent of angiosperms, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
92%
From NCERT
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In the female gametophyte of angiosperms, filiform apparatus is a part of:
1. Synergids
2. Antipodals
3. Central cell
4. Egg
1. Synergids
2. Antipodals
3. Central cell
4. Egg
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
95%
From NCERT
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All the following plants are pollinated by water except:
1. Vallisneria
2. Hydrilla
3. Zostera
4. Eicchornia
1. Vallisneria
2. Hydrilla
3. Zostera
4. Eicchornia
Subtopic: Pollination & Outbreeding Devices |
79%
From NCERT
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In angiosperms, the pollen tub, carrying male gametes, enters into the embryo sac through the:
1. chalaza
2. nucellus
3. micropyle
4. funiculus
1. chalaza
2. nucellus
3. micropyle
4. funiculus
Subtopic: Pollen - Pistil Interaction |
91%
From NCERT
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It is possible to store pollen grains of a large number of species for years in liquid nitrogen at:
1. 0°C
2. 4°C
3. -196°C
4. -273°C
1. 0°C
2. 4°C
3. -196°C
4. -273°C
Subtopic: Stamen: Male Gametophyte |
97%
From NCERT
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Consider the two given statements:
| Statement I: | Gynoecium of Papaver is multicarpellary and apocarpous. |
| Statement II: | Gynoecium of Michelia is multicarpellary and syncarpous. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
79%
From NCERT
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Regarding double fertilization in angiosperms:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | syngamy requires one male gamete and one egg cell |
| II: | triple fusion requires one male gamete, one egg cell and one polar nucleus |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Double Fertilization |
83%
From NCERT
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A typical angiosperm anther in transverse section will show:
| 1. | two lobes, each lobe having two theca and each theca having two microsporangia |
| 2. | two lobes, each lobe having two theca and each theca having four microsporangia |
| 3. | two lobes, each lobe having two theca and each lobe having two microsporangia |
| 4. | two lobes, each lobe having two theca and each lobe having four microsporangia |
Subtopic: Stamen: Anther |
52%
From NCERT
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Identify the correct statement related to Pollination:
| 1. | Water is the most important pollinating agent for angiosperms |
| 2. | Pollination by water is seen in all aquatic flowering plants |
| 3. | Pollination by wind is more common amongst abiotic pollination |
| 4. | Very few flowers are pollinated by insects |
Subtopic: Pollination & Outbreeding Devices |
93%
From NCERT
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Which one of the following statements is true?
| 1. | Exine of pollen grains is made up of cellulose and pectin |
| 2. | Pollen grains of many species cause severe allergies |
| 3. | Pollens cannot be stored in liquid nitrogen |
| 4. | Tapetum helps in the dehiscence of anther |
Subtopic: Stamen: Male Gametophyte |
88%
From NCERT
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