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Q. No.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
Subtopic: Apomixis & Polyembryony |
83%
Level 1: 80%+
NEET - 2022
Hints
To ensure that only the desired pollens fall on the stigma in artificial hybridization process :
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: Pollination & Outbreeding Devices | Post Pollination Events |
76%
Level 2: 60%+
NEET - 2022
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Albuminous seeds store their reserve food mainly in:
1. Endosperm
2. Cotyledons
3. Hypocotyl
4. Perisperm
1. Endosperm
2. Cotyledons
3. Hypocotyl
4. Perisperm
Subtopic: Seed |
77%
Level 2: 60%+
NEET - 2013
Hints
Which of the following statements is correct?
| 1. | Sporopollenin can be degraded by enzymes |
| 2. | Sporopollenin in made up of inorganic materials |
| 3. | Sporopollenin can withstand high temperatures as well as strong acids and alkalis |
| 4. | Sporopollenin can withstand high temperatures but not strong acids |
Subtopic: Stamen: Male Gametophyte |
91%
Level 1: 80%+
NEET - 2013
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Adventive embryony is a type of apomixis where the embryos are derived directly from:
1. Nucellus or integument
2. Zygote
3. Synergids of antipodals of embryo sac
4. Accessory embryo sac in the ovule
1. Nucellus or integument
2. Zygote
3. Synergids of antipodals of embryo sac
4. Accessory embryo sac in the ovule
Subtopic: Embryo |
70%
Level 2: 60%+
Please attempt this question first.
Hints
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: Pistil: Ovule | Embryo |
78%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
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: Stamen: Male Gametophyte |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
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. |
Subtopic: Apomixis & Polyembryony |
79%
Level 2: 60%+
NEET - 2022
Hints
The residual persistent part which forms the perisperm in the seeds of beet is :
1. Calyx
2. Endosperm
3. Nucellus
4. Integument
1. Calyx
2. Endosperm
3. Nucellus
4. Integument
Subtopic: Embryo | Seed |
79%
Level 2: 60%+
NEET - 2022
Hints
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: Pollen - Pistil Interaction |
67%
Level 2: 60%+
NEET - 2022
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