Assertion (A):
Hybrids are widely used in cultivation to increase productivity and apomixes can be an important tool for maintaining hybrid nature.
Reason (R):
Seeds produced by apomictic plants are identical to mother plant as there is no segregation
Mark the correct option :
1.
Both (A) & (R) are true and (R) is the correct explanation of (A).
2.
Both (A) & (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true statement but (R) is false.
4.
Both (A) and (R) are false statements.
Subtopic: Apomixis & Polyembryony |
76%
Level 2: 60%+
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The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?
1. binary fission
2. mitosis
3. meiosis
4. mitosis without subsequent cytokinesis
1. binary fission
2. mitosis
3. meiosis
4. mitosis without subsequent cytokinesis
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
74%
Level 2: 60%+
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Match the following and choose correct option
Option
1. A-1,B-ii, C-iii, D-iv
2. A-ii, B-I, C-iv, D-iii
3. A-iv, B-ii, C-I, D-iii
4. A-ii, B-iv, C-I, D-iii
| Group-A | Group-B |
| A. Aleurone layer | i. without fertilization |
| B. Parthenocarpic fruit | ii. Nutrition |
| C. Ovule | iii. Double fertilization |
| D. Endosperm | iv. Seed |
Option
1. A-1,B-ii, C-iii, D-iv
2. A-ii, B-I, C-iv, D-iii
3. A-iv, B-ii, C-I, D-iii
4. A-ii, B-iv, C-I, D-iii
Subtopic: Endosperm |
93%
Level 1: 80%+
Hints
| Assertion (A): | The megaspore mother cell divide mitotically to produce four spores. |
| Reason (R): | Megaspore mother cells are diploid and megaspore is haploid. |
| 1. | Both (A) & (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) & (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
65%
Level 2: 60%+
Hints
The functional role of sporopollenin is primarily to
1. comprise spore surface structures that catch the wind and assist in spore dispersal
2. reduce dehydration
3. make spores less dense and able to disperse more readily
4. repel toxic chemicals
1. comprise spore surface structures that catch the wind and assist in spore dispersal
2. reduce dehydration
3. make spores less dense and able to disperse more readily
4. repel toxic chemicals
Subtopic: Pollination & Outbreeding Devices |
Level 3: 35%-60%
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Hints
The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. Consequently, what should one expect to be true of such seeds?
1. They require extensive periods of dormancy during which the embryo develops
2. They are surrounded by brightly colored, sweet fruit
3. They germinate very soon after being released from the ovary
4. The developing embryo within is dependent upon the gametophyte for nutrition
1. They require extensive periods of dormancy during which the embryo develops
2. They are surrounded by brightly colored, sweet fruit
3. They germinate very soon after being released from the ovary
4. The developing embryo within is dependent upon the gametophyte for nutrition
Subtopic: Seed |
Level 3: 35%-60%
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Hints
Recent research has shown that pollination requires that carpels recognize pollen grains as "self or nonself." For self-incompatibility, the system requires
1. the rejection of nonself cells
2. the rejection of self cells.
3. carpel incompatibility with the egg cells.
4. that the flowers be incomplete.
1. the rejection of nonself cells
2. the rejection of self cells.
3. carpel incompatibility with the egg cells.
4. that the flowers be incomplete.
Subtopic: Pollen - Pistil Interaction |
67%
Level 2: 60%+
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Which of the following is the correct sequence of events in a pollen sac?
| 1. | sporangia → meiosis → two haploid cells → meiosis → two pollen grains per cell |
| 2. | pollen grain → meiosis → two generative cells → two tube cells per pollen grain |
| 3. | two haploid cells → meiosis → generative cell → tube cell-fertilization → pollen grain |
| 4. | microsporocyte → meiosis → microspores → mitosis → two haploid cells per pollen grain |
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
66%
Level 2: 60%+
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Hints
Please attempt this question first.
Consider the given two statements:
| Assertion (A): | Nocturnal flowers are pollinated by moths. |
| Reason (R): | Nocturnal flowers are highly fragrant and dull in colour |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 3. | (A) is True, (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Pollination & Outbreeding Devices |
51%
Level 3: 35%-60%
Hints
Subtopic: Pollination & Outbreeding Devices |
94%
Level 1: 80%+
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