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.
Subtopic: Pollen - Pistil Interaction |
66%
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
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 |
65%
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 |
52%
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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A typical embryo sac in Angiosperms at maturity is
1. 7 nucleate and 8 celled
2. 8 nucleate and 7 celled
3. 4 nucleate and 7 celled
4. 8 nucleate and 8 celled
1. 7 nucleate and 8 celled
2. 8 nucleate and 7 celled
3. 4 nucleate and 7 celled
4. 8 nucleate and 8 celled
Subtopic: Pistil: Female Gametophyte |
92%
From NCERT
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Triple fusion in angiosperms is the fusion of second sperm with
1. Antipodal cell and one synergid cell
2. Two antipodal cells
3. Two synergid cells
4. Two polar nuclei
1. Antipodal cell and one synergid cell
2. Two antipodal cells
3. Two synergid cells
4. Two polar nuclei
Subtopic: Double Fertilization |
87%
From NCERT
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In general the egg apparatus of embryo sac in angiosperm consists of:
| 1. | One egg cell, two synergids, three antipodal cells, two Polar nuclei |
| 2. | One egg cell, two synergids, two antipodal cells, three Polar nuclei |
| 3. | One egg cell, three synergids, two antipodal cells, two Polar nuclei |
| 4. | One egg cell, two synergids, two antipodal cells, two Polar nuclei |
Subtopic: Pistil: Female Gametophyte |
89%
From NCERT
NEET - 2022
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