The residual persistent part which forms the perisperm in the seeds of beet is :
1. Calyx
2. Endosperm
3. Nucellus
4. Integument
Subtopic: Â Embryo |Â Seed |
 79%
From NCERT
NEET - 2022
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Which one among the following statements is not true with respect to the pollen grains?
1. They can be stored in liquid nitrogen for years
2. It can cause severe allergy in some people
3. Sporopollenin is one of the most resistant organic material present in its wall
4. Intine layer is thick made up of cellulose and lignin
1. They can be stored in liquid nitrogen for years
2. It can cause severe allergy in some people
3. Sporopollenin is one of the most resistant organic material present in its wall
4. Intine layer is thick made up of cellulose and lignin
Subtopic: Â Stamen: Male Gametophyte |
 92%
From NCERT
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Read the following statements and mark true (T) or false (F)
(I) During post-fertilisation events, zygote develops into endosperm in angiosperms
(II) The synergids and antipodals degenerate after fertilisation.
I II
1. T T
2. T F
3. F T
4. F F
(I) During post-fertilisation events, zygote develops into endosperm in angiosperms
(II) The synergids and antipodals degenerate after fertilisation.
I II
1. T T
2. T F
3. F T
4. F F
Subtopic: Â Pistil: Ovule |Â Embryo |
 78%
From NCERT
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Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops ?
1. Polyembryony will be seen and each seed will produce many plantlets
2. Seeds of hybrid plants will show longer dormancy
3. Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year
4. There will be segregation of the desired characters only in the progeny
1. Polyembryony will be seen and each seed will produce many plantlets
2. Seeds of hybrid plants will show longer dormancy
3. Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year
4. There will be segregation of the desired characters only in the progeny
Subtopic: Â Apomixis & Polyembryony |
 77%
From NCERT
NEET - 2022
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To ensure that only the desired pollens fall on the stigma in artificial hybridization process :
(a) the female flower buds of plant producing unisexual flower need not be bagged.
(b) there is no need to emasculate unisexual flowers of selected female parent
(c) emasculated flowers are to be bagged immediately after cross pollination
(d) emasculated flowers are to be bagged after removal of anthers
(e) bisexual flowers, showing protogyny are never selected for cross
Choose the correct answer from the options given below :
(a) the female flower buds of plant producing unisexual flower need not be bagged.
(b) there is no need to emasculate unisexual flowers of selected female parent
(c) emasculated flowers are to be bagged immediately after cross pollination
(d) emasculated flowers are to be bagged after removal of anthers
(e) bisexual flowers, showing protogyny are never selected for cross
Choose the correct answer from the options given below :
| 1. | (a), (b) and (c) only | 2. | (b), (c) and (d) only |
| 3. | (b), (c) and (e) only | 4. | (a), (d) and (e) only |
Subtopic: Â Pollination & Outbreeding Devices |Â Post Pollination Events |
 73%
From NCERT
NEET - 2022
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To ensure that only the desired pollens fall on the stigma in artificial hybridization process:
Choose the correct answer from the options given below:
1. (a), (b) and (c) only
2. (b), (c) and (d) only
3. (b), (c) and (e) only
4. (a), (d) and (e) only
| a: | the female flower buds of plant producing unisexual flower need not be bagged. |
| b: | there is no need to emasculate unisexual flowers of selected female parent. |
| c: | emasculated flowers are to be bagged immediately after cross pollination. |
| d: | emasculated flowers are to be bagged after removal of anthers. |
| e: | bisexual flowers, showing protogyny are never selected for cross. |
1. (a), (b) and (c) only
2. (b), (c) and (d) only
3. (b), (c) and (e) only
4. (a), (d) and (e) only
Subtopic: Â Pollen - Pistil Interaction |
 65%
From NCERT
NEET - 2022
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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: Â Pistil: Female Gametophyte |
 89%
From NCERT
NEET - 2022
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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: Â Double Fertilization |
 87%
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: Â Pistil: Female Gametophyte |
 92%
From NCERT
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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: Â Pollination & Outbreeding Devices |
 89%
From NCERT
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