Assertion (A):
The megaspore mother cell divide mitotically to produce four spores.
Reason (R):
Megaspore mother cells are diploid and megaspore is haploid.
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 but (R) is false.
4.
Both (A) is false but (R) is true.
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
65%
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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 |
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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 |
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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%
From NCERT
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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%
From NCERT
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| 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. | (A) is false and (R) is false |
Subtopic: Pollination & Outbreeding Devices |
51%
From NCERT
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Subtopic: Pollination & Outbreeding Devices |
93%
From NCERT
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Which of the following is/are NOT developed from ovary?
A. Apple
B. Tomato
C. Mango
D. Coconut
E. Cashewnut
Choose the correct answer from the options given below:
1. A and B only
2. A only
3. A, C and D only
4. A and E only
A. Apple
B. Tomato
C. Mango
D. Coconut
E. Cashewnut
Choose the correct answer from the options given below:
1. A and B only
2. A only
3. A, C and D only
4. A and E only
Subtopic: Fruit |
78%
From NCERT
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Double fertilization in flowering plants
A. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing syngamy
B. And develop the endosperm
C. Results in the formation of a diploid cell, zygote
D. The other male gamete moves towards the two pollen nuclei located in the central cell and fused with to produce PEN
E. Syngamy and triple fusion takes place in the embryo sac
Choose the correct answer from the options given below:
1. A, B, D, E only
2. A, C, D, E only
3. A & D only
4. A, C, D only
A. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing syngamy
B. And develop the endosperm
C. Results in the formation of a diploid cell, zygote
D. The other male gamete moves towards the two pollen nuclei located in the central cell and fused with to produce PEN
E. Syngamy and triple fusion takes place in the embryo sac
Choose the correct answer from the options given below:
1. A, B, D, E only
2. A, C, D, E only
3. A & D only
4. A, C, D only
Subtopic: Double Fertilization |
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Characteristics of wind-pollinated plants are
A. Well exposed stamens
B. Colorful flowers
C. Non-sticky pollen
D. Fragrant flowers
E. Flowers rich in nectar
Choose the correct answer from the option given below:
1. A & B only
2. A & C only
3. A, B & C only
4. C, D & E only
A. Well exposed stamens
B. Colorful flowers
C. Non-sticky pollen
D. Fragrant flowers
E. Flowers rich in nectar
Choose the correct answer from the option given below:
1. A & B only
2. A & C only
3. A, B & C only
4. C, D & E only
Subtopic: Pollination & Outbreeding Devices |
89%
From NCERT
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