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Q. No.
Assertion(A): Water hyacinth can propagate vegetatively at a phenomenal rate.
Reason(R): It is very difficult to get rid off water hyacinth once introduced into the water body.
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. (A) is false, but (R) is true.
Subtopic: Asexual Reproduction |
53%
From NCERT
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Assertion(A): Dioecious organisms must have a special mechanism for gamete transfer.
Reason(R): Male and female gametes are produced in different individuals.
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. (A) is false, but (R) is true.
Reason(R): Male and female gametes are produced in different individuals.
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. (A) is false, but (R) is true.
Subtopic: Events during Sexual reproduction |
69%
From NCERT
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Assertion(A): Seasonal breeders are reproductively active throughout their reproductive phase.
Reason(R): Seasonal breeders do wait for favorable seasons for 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. (A) is false, but (R) is true.
Reason(R): Seasonal breeders do wait for favorable seasons for 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. (A) is false, but (R) is true.
Subtopic: Sexual Reproduction |
61%
From NCERT
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Assertion(A): Pollen grains have to be transferred to stigma after fertilization.
Reason(R): Pollen grains are the carriers of male gametes.
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. (A) is false, but (R) is true.
Reason(R): Pollen grains are the carriers of male gametes.
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. (A) is false, but (R) is true.
Subtopic: Events during Sexual reproduction |
72%
From NCERT
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In angiosperms, after fertilization:
I: The zygote develops into the embryo.
II. The ovules develop into the seed.
III. The ovary develops into the fruit.
IV. A thick protective fruit wall called pericarp develops.
1. Only I, II and IV are correct
2. Only II, III and IV are correct
3. Only I, II and III are correct
4. I, II, III and IV are correct
I: The zygote develops into the embryo.
II. The ovules develop into the seed.
III. The ovary develops into the fruit.
IV. A thick protective fruit wall called pericarp develops.
1. Only I, II and IV are correct
2. Only II, III and IV are correct
3. Only I, II and III are correct
4. I, II, III and IV are correct
Subtopic: Events during Sexual reproduction |
86%
From NCERT
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The genus, Ophioglossum, has the largest number of chromosomes in the known plant kingdom. The number of chromosomes in its meiocyte is:
1. 48
2. 96
3. 630
4. 1260
1. 48
2. 96
3. 630
4. 1260
Subtopic: Sexual Reproduction |
75%
From NCERT
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The vegetative propagule in the angiosperm Agave is known as:
1. Bulbil
2. Runner
3. Rhizome
4. Bulb
1. Bulbil
2. Runner
3. Rhizome
4. Bulb
Subtopic: Asexual Reproduction |
91%
From NCERT
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Strobilanthes kunthiana [neelakurinji] flowers once in every:
1. 2 years
2. 12 years
3. 20 to 25 years
4. 50 to 100 years
Subtopic: Sexual Reproduction |
94%
From NCERT
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Identify the correct statements amongst the following:
| A: | All sexually reproducing organisms are diploid. |
| B: | The major difference between different cells in the same organism is that they have different DNA. |
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
Subtopic: Events during Sexual reproduction |
From NCERT
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Clear cut vegetative, reproductive and senescent phases are seen in:
I: Annual plants
II: Biennial plants
III: Perennial plants
1. Only I
2. Only III
3. Only I and II
4. I, II and III
I: Annual plants
II: Biennial plants
III: Perennial plants
1. Only I
2. Only III
3. Only I and II
4. I, II and III
Subtopic: Sexual Reproduction |
74%
From NCERT
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