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Q. No.In angiosperms, the pollen tub, carrying male gametes, enters into the embryo sac through the:
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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Both autogamy and geitonogamy are prevented in:
1. Monoecy
2. Dioecy
3. Chasmogamy
4. Cleistogamy
1. Monoecy
2. Dioecy
3. Chasmogamy
4. Cleistogamy
Subtopic: Pollination & Outbreeding Devices |
84%
From NCERT
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What is the function of tassels in the corn cob?
| 1. | To protect seeds | 2. | To attract insects |
| 3. | To trap pollen grains | 4. | To disperse pollen grains |
Subtopic: Pollination & Outbreeding Devices |
78%
From NCERT
NEET - 2023
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In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are :
| 1. | Synergids, antipodals and Polar nuclei |
| 2. | Synergids, Primary endosperm nucleus and zygote |
| 3. | Antipodals, synergids, and primary endosperm nucleus |
| 4. | Synergids, Zygote and Primary endosperm nucleus |
Subtopic: Double Fertilization |
80%
From NCERT
NEET - 2023
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