During the formation of the embryo sac in angiosperms, cell walls are laid:
1.
from the first nuclear division
2.
between the 2-nucleate and 4-nucleate stage
3.
before the 8-nucleate stage
4.
after the 8-nucleate stage
Subtopic: Pistil: Female Gametophyte |
73%
From NCERT
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The pollen intine is:
| 1. | a thin and continuous layer made up of cellulose and pectin. |
| 2. | a thick and discontinuous layer made up of cellulose and pectin. |
| 3. | made up of sporopollenin and is a continuous layer. |
| 4. | made up of sporopollenin and has prominent apertures called germ pores. |
Subtopic: Stamen: Anther | Stamen: Male Gametophyte |
92%
From NCERT
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How many of the given statements are correct:
1. 2
2. 3
3. 4
4. 5
| I: | Endosperm development precedes embryo development. |
| II: | The coconut water from tender coconut is cellular endosperm. |
| III: | The white kernel in coconut is free nuclear endosperm. |
| IV: | Endosperm is completely consumed by the developing embryo in pea. |
| V: | Endosperm persists in the mature seed of castor. |
2. 3
3. 4
4. 5
Subtopic: Endosperm |
67%
From NCERT
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Study the given figure and select the correct statements:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| 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). |
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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