Zea mays have 20 chromosomes in its somatic cell. The number of chromosomes in its endosperm will be:
1. 10
2. 20
3. 30
4. 40
Subtopic: Â Double Fertilization |Â Endosperm |
 77%
From NCERT
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The two innermost wall layers of microsporangium in an anther are:
| 1. | Endothecium and tapetum |
| 2. | Epidermis and endodermis |
| 3. | Epidermis and middle layer |
| 4. | Middle layer and tapetum |
Subtopic: Â Stamen: Microsporangium |
 82%
From NCERT
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At maturity, the female gametophyte in angiosperms has:
| I: | Three cells grouped together at the micropylar end constituting the egg apparatus |
| II: | Three cells are at the chalazal end and are called the antipodals |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Â Pistil: Ovule |Â Pistil: Female Gametophyte |
 88%
From NCERT
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Consider the two statements:
| Statement I: | Cleistogamous flowers are invariably autogamous. |
| Statement II: | Chasmogamous flowers can never be autogamous. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Pollination & Outbreeding Devices |
 81%
From NCERT
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Cells of which of the following wall layer of microsporangium possess dense cytoplasm and generally have more than one nucleus?
1. epidermis
2. endothecium
3. middle layers
4. tapetum
1. epidermis
2. endothecium
3. middle layers
4. tapetum
Subtopic: Â Stamen: Anther |Â Stamen: Microsporangium |
 91%
From NCERT
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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: Â 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: Â Stamen: Anther |Â 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: Â 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: Â Stamen: Microsporangium |Â 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: Â Pistil: Ovule |Â Pistil: Female Gametophyte |
 95%
From NCERT
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