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Q. No.Both autogamy and geitonogamy are prevented in:
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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Large, colorful, fragrant flowers with nectar are seen in:
| 1. | wind pollinated plants | 2. | insect pollinated plants |
| 3. | bird pollinated plants | 4. | bat pollinated plants |
Subtopic: Pollination & Outbreeding Devices |
88%
From NCERT
NEET - 2023
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In which of the following sets of families, the pollen grain are viable for months?
1. Solanaceae, Poaceae and Liliaceae
2. Brassicaceae, Liliaceae and Poaceae
3. Rosaceae, Liliaceae and Poaceae
4. Leguminosae, Solanaceae and Rosaceae
1. Solanaceae, Poaceae and Liliaceae
2. Brassicaceae, Liliaceae and Poaceae
3. Rosaceae, Liliaceae and Poaceae
4. Leguminosae, Solanaceae and Rosaceae
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
83%
From NCERT
NEET - 2023
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Transfer of pollen grains from anther to stigma of another flower of same plant is known as:
| 1. | Geitonogamy | 2. | Xenogamy |
| 3. | Autogamy | 4. | Cleistogamy |
Subtopic: Pollination & Outbreeding Devices |
86%
From NCERT
NEET - 2023
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In angiosperms, the correct sequence of events leading to the formation of female gametophyte in the ovule is:
Choose the correct answer from the options given below:
| A. | 3 successive free nuclear divisions in functional megaspore. |
| B. | Degeneration of 3 megaspores |
| C. | Meiotic division in megaspore mother cell |
| D. | Migration of 3 nuclei towards each pole. |
| E. | Formation of a wall resulting in seven celled embryosac. |
Choose the correct answer from the options given below:
| 1. | (A), (B), (C), (D), (E) | 2. | (C), (E), (A), (D), (B) |
| 3. | (B), (C), (A), (D), (E) | 4. | (C), (B), (A), (D), (E) |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
76%
From NCERT
NEET - 2023
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Select the incorrect match.
1. Zygote \(\xrightarrow[\text{into}]{\text{develops}}\) Embryo
2. Ovules \(\xrightarrow[\text{into}]{\text{develop}}\) Seeds
3. Ovary \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit
4. Integument \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit wall
1. Zygote \(\xrightarrow[\text{into}]{\text{develops}}\) Embryo
2. Ovules \(\xrightarrow[\text{into}]{\text{develop}}\) Seeds
3. Ovary \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit
4. Integument \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit wall
Subtopic: Fruit |
82%
From NCERT
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Given below are two statements:
| Assertion (A): | Pollen grains of flowering plants can be well preserved as fossils. |
| Reason (R): | Hard outer layer of pollen grains is made up of most resistant, non degradable organic material called as sporopollenin. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Stamen: Male Gametophyte |
92%
From NCERT
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Given below are two statements:
| Assertion (A): | At maturity, a typical angiospermic embryo sac is 7 celled 8-nucleated structure. |
| Reason (R): | There is a characteristic distribution of the cells within the embryo sac of the angiosperms. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Pistil: Ovule |
51%
From NCERT
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