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Q. No.Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
Both wind and water pollinated flowers are not very colourful and do not produce nectar.
Reason (R):
The flowers produce enormous amount of pollen grains in wind and water pollinated flowers.
In the light of the above statements, choose the correct answer from the options given below.
1.
(A) is True but (R) is False.
2.
(A) is False but (R) is True.
3.
Both (A) and (R) are True and (R) is the correct explanation of (A).
4.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
Subtopic: Pollination & Outbreeding Devices |
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How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant?
1. 1 Meiosis and 3 Mitosis
2. No Meiosis and 2 Mitosis
3. 2 Meiosis and 3 Mitosis
4. 1 Meiosis and 2 Mitosis
1. 1 Meiosis and 3 Mitosis
2. No Meiosis and 2 Mitosis
3. 2 Meiosis and 3 Mitosis
4. 1 Meiosis and 2 Mitosis
Subtopic: Pistil: Female Gametophyte |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
In light of the above statement, choose the most appropriate answer from the options given below:
| Assertion (A): | Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. |
| Reason (R): | The presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Stamen: Microsporangium |
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Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the correct from the options given below:
| Assertion (A): | A typical unfertilised, angiosperm embryo sac at maturity is 8-nucleate and 7-celled. |
| Reason (R): | The egg apparatus has 2 polar nuclei. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
Subtopic: Pistil: Female Gametophyte |
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Arranging the following in the correct developmental sequence related to microsporogenesis:
Choose the correct answer from the options given below:
| A. | Microspore tetrads |
| B. | Sporogenous tissue |
| C. | Pollen grains |
| D. | Pollen mother cells |
| 1. | D, A, C, B | 2. | B, D, C, A |
| 3. | B, D. A, C | 4. | A, D, C, B |
Subtopic: Stamen: Microsporangium |
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Which one of the following is a triploid cell ?
| 1. | Central cell | 2. | Primary endosperm cell |
| 3. | Zygote | 4. | Synergid |
Subtopic: Double Fertilization |
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Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
1. Geitonogamy
2. Autogamy
3. Xenogamy
4. Cleistogamy
1. Geitonogamy
2. Autogamy
3. Xenogamy
4. Cleistogamy
Subtopic: Pollination & Outbreeding Devices |
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Subtopic: Seed |
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Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the eggs ?
1. Polar nucleus
2. Antipodals
3. Synergids
4. Central cells
1. Polar nucleus
2. Antipodals
3. Synergids
4. Central cells
Subtopic: Pistil: Ovule |
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If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm?
| 1. | 72 | 2. | 18 |
| 3. | 36 | 4. | 54 |
Subtopic: Double Fertilization |
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