Q. No.During microsporogenesis in flowering plants, each microspore mother cell undergoes meiosis to produce how many microspores, and what is their arrangement called when they remain together temporarily?
1. Two microspores; dyad
2. Four microspores; tetrad
3. Four microspores; triad
4. Eight microspores; octad
1. Two microspores; dyad
2. Four microspores; tetrad
3. Four microspores; triad
4. Eight microspores; octad
Subtopic: Stamen: Microsporangium | Pre-fertilisation: Structures and Events |
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What would be the fate of a Microspore if the tapetum is not developed in the Microsporangium?
1. Microspores will undergo meiosis
2. Nourishment will be deprived to microspores
3. There will be no change
4. Microspores will undergo mitosis
1. Microspores will undergo meiosis
2. Nourishment will be deprived to microspores
3. There will be no change
4. Microspores will undergo mitosis
Subtopic: Stamen: Microsporangium |
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The tapetum layer in the anther performs which critical function during pollen development?
| 1. | Protection of pollen grains only |
| 2. | Nourishment and providing sporopollenin for exine formation |
| 3. | Separation of microspore tetrads |
| 4. | Formation of the anther wall |
Subtopic: Stamen: Anther | Stamen: Microsporangium |
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The innermost layer of microsporangium, that has polyploid and multinucleate cells, is:
(1) Epidermis
(2) Endothecium
(3) Middle layers
(4) Tapetum
Subtopic: Stamen: Microsporangium |
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Which one of the following statements is correct?
1. Hard outer layer of pollen is called intine
2. Sporogenous tissue is haploid
3. Endothelium produces the microspores
4. Tapetum nourishes the developing pollen
1. Hard outer layer of pollen is called intine
2. Sporogenous tissue is haploid
3. Endothelium produces the microspores
4. Tapetum nourishes the developing pollen
Subtopic: Stamen: Microsporangium |
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The innermost layer of anther wall is
| 1. | Endothecium and it provides nutrition to pollens |
| 2. | Tapetum and it nourishes the developing pollen grains |
| 3. | Nucellus and it forms microspores |
| 4. | Endothecium and it helps in dehiscence of anther |
Subtopic: Stamen: Anther | Stamen: Microsporangium |
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Which cells undergo meiosis during microsporogenesis?
1. Tapetum cells
2. Microspore mother cells
3. Microspores
4. Pollen grains.
1. Tapetum cells
2. Microspore mother cells
3. Microspores
4. Pollen grains.
Subtopic: Stamen: Microsporangium |
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Match the following structures with their function:
Options:
| List-I (Structure) |
List-II (Function) |
||
| A. | Tapetum | I. | Nourishment and development of microspores |
| B. | Endothecium | II. | Pollen tube guidance |
| C. | Pollen grains | III. | Dehiscence of anther |
| D. | Synergids | IV. | Male gametophyte |
| 1. | A-I, B-II, C-III, D-IV | 2. | A-III, B-I, C-II, D-IV |
| 3. | A-I, B-III, C-IV, D-II | 4. | A-II, B-I, C-III, D-IV |
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte | Pistil: Ovule |
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Identify the incorrect statement about a typical microsporangium:
| 1. | In a transverse section, a typical microsporangium appears near circular and is surrounded by four wall layers: the epidermis, endothecium, middle layers, and the tapetum. |
| 2. | The innermost wall layer, the tapetum, nourishes the developing pollen grains and possesses dense cytoplasm and often more than one nucleus. |
| 3. | The function of the outer three wall layers includes protection and aiding in the dehiscence of anther to release pollen. |
| 4. | The outer three wall layers of the microsporangium function solely for nourishment of the developing pollen grains. |
Subtopic: Stamen: Microsporangium |
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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 |
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