Transfer of pollen grains from anther to stigma of another flower of same plant is known as:
1. Geitonogamy 2. Xenogamy
3. Autogamy 4. Cleistogamy

Subtopic:  Pollination & Outbreeding Devices |
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From NCERT
NEET - 2023
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In angiosperms, the correct sequence of events leading to the formation of female gametophyte in the ovule is:
A. 3 successive free nuclear divisions in functional megaspore.
B. Degeneration of 3 megaspores
C. Meiotic division in megaspore mother cell
D. Migration of 3 nuclei towards each pole.
E. Formation of a wall resulting in seven celled embryosac. 


Choose the correct answer from the options given below:
1. (A), (B), (C), (D), (E) 2. (C), (E), (A), (D), (B)
3. (B), (C), (A), (D), (E) 4. (C), (B), (A), (D), (E)
Subtopic:  Pistil: Ovule | Pistil: Female Gametophyte |
 76%
From NCERT
NEET - 2023
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Select the incorrect match.
1. Zygote \(\xrightarrow[\text{into}]{\text{develops}}\) Embryo
2. Ovules \(\xrightarrow[\text{into}]{\text{develop}}\) Seeds
3. Ovary \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit
4. Integument \(\xrightarrow[\text{into}]{\text{develops}}\) Fruit wall
Subtopic:  Fruit |
 82%
From NCERT
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Given below are two statements: 
Assertion (A): Pollen grains of flowering plants can be well preserved as fossils.
Reason (R): Hard outer layer of pollen grains is made up of most resistant, non degradable organic material called as sporopollenin.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.


 
Subtopic:  Stamen: Male Gametophyte |
 92%
From NCERT
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Given below are two statements: 
Assertion (A): At maturity, a typical angiospermic embryo sac is 7 celled 8-nucleated structure.
Reason (R): There is a characteristic distribution of the cells within the embryo sac of the angiosperms. 
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Pistil: Ovule |
 51%
From NCERT
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Given below are two statements: 
Assertion (A): Cleistogamous flowers are invariably autogamous.
Reason (R): Cleistogamous flowers never expose their sex organs, so there is no chance of cross pollination in these flowers. 
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Pollination & Outbreeding Devices |
 90%
From NCERT
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Given below are two statements: 
Assertion (A): Some species of Asteraceae and grasses have evolved special mechanism to produce seeds
without fertilisation called as apomixis.
Reason (R): Apomixis is a form of asexual reproduction that mimics sexual reproduction.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Apomixis & Polyembryony |
 55%
From NCERT
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Given below are two statements: 
Assertion (A): Cultivation of hybrids has tremendously increased the productivity.
Reason (R): If hybrids are made into apomicts, there is segregation of characters in the hybrid progeny.-
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Apomixis & Polyembryony |
 59%
From NCERT
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Given below are two statements: 
Assertion (A): Pollen grains are not rich in nutrients.
Reason (R): Pollen consumption does not increase the performance of athletes and race horses. 
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Stamen: Male Gametophyte |
 92%
From NCERT
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Given below are two statements: 
Assertion (A): Pollen grains represent the male gametophytes.
Reason (R): The cell wall of pollen grain is called sporoderm.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Stamen: Male Gametophyte |
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