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Q. No.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 :
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 |
74%
From NCERT
NEET - 2022
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Animal vectors are required for pollination in:
1. Vallisneria
2. Mulberry
3. Cucumber
4. Maize
1. Vallisneria
2. Mulberry
3. Cucumber
4. Maize
Subtopic: Pollination & Outbreeding Devices |
NEET - 2013
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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%
From NCERT
NEET - 2013
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Which one of the following statements is correct?
| 1. | Cleistogamous flowers are always autogamous |
| 2. | Xenogamy occurs only by wind pollination |
| 3. | Chasmogamous flowers do not open at all |
| 4. | Geitonogamy involves the pollen and stigma of flowers of different plants |
Subtopic: Pollination & Outbreeding Devices |
87%
From NCERT
NEET - 2013
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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%
From NCERT
NEET - 2013
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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 |
Subtopic: Apomixis & Polyembryony |
79%
From NCERT
NEET - 2022
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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 |
68%
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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: Pistil: Ovule | Embryo |
78%
From NCERT
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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: Stamen: Male Gametophyte |
92%
From NCERT
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Regarding a typical monosporic embryosac in the angiosperms:
I: Three cells are grouped together at the micropylar end and constitute the egg apparatus.
II: The egg apparatus, in turn, consists of two antipodals and one egg cell.
III: The antipodals have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
IV: Three cells are at the chalazal end and are called the Synergids.
1. Only I is correct
2. Only I and IV are correct
3. Only II and III are correct
4. Only III is correct
I: Three cells are grouped together at the micropylar end and constitute the egg apparatus.
II: The egg apparatus, in turn, consists of two antipodals and one egg cell.
III: The antipodals have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
IV: Three cells are at the chalazal end and are called the Synergids.
1. Only I is correct
2. Only I and IV are correct
3. Only II and III are correct
4. Only III is correct
Subtopic: Monocarpic & Polycarpic | Pistil: Ovule | Pistil: Female Gametophyte |
74%
From NCERT
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