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Q. No.Select the correct sequence w.r.t evolution of plant forms.
1.
Rhynia-type plants → Psilophyton → Seed ferns → Progymnosperms → Cycads
2.
Chlorophyte ancestors → Rhynia-type plants → Tracheophyte ancestors → Psilophyton
3.
Tracheophyte ancestors → Zosterophyllum → Lycopods
4.
Chlorophyte ancestors → Tracheophyte ancestors → Bryophytes
Subtopic: Concept of Organic Evolution: Evidence: 1 |
From NCERT
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Set which includes only analogous organs
1. wings of butterfly, housefly, and bat
2. hindlegs of horse, grasshopper, and bat
3. wings of butterfly and wingspread of bat and birds
4. mandibles of cockroach, mosquito, and honey bee
1. wings of butterfly, housefly, and bat
2. hindlegs of horse, grasshopper, and bat
3. wings of butterfly and wingspread of bat and birds
4. mandibles of cockroach, mosquito, and honey bee
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
From NCERT
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Consider the given two statements:
| Assertion (A): | Forelimbs in mammals have varying functions but are all homologous. |
| Reason (R): | The forelimbs of vertebrates are homologous. |
| 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: A BRIEF ACCOUNT OF EVOLUTION |
From NCERT
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Consider the given two statements:
| Assertion (A): | Pest species evolve pesticide resistance via natural selection. |
| Reason (R): | After exposure to pesticides, some pests develop mutations that enable them to survive and leave progeny. |
| 1. | (A) is False but (R) is True. |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Natural Selection |
From NCERT
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Consider the given two statements:
| Assertion: | Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. |
| Reason: | Natural selection is a key mechanism of evolution. |
| 1. | (A) is True but (R) is False |
| 2. | (A) is False but (R) is True |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: Natural Selection |
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Consider the given two statements:
| Assertion (A): | Evolution by natural selection, in a True sense would have started when cellular forms of life with differences in metabolic capability originated on earth. |
| Reason (R): | Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 4. | (A) is False but (R) is True |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
From NCERT
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Consider the given two statements:
| Assertion (A): | Almost all fossils are preserved in sedimentary rock. |
| Reason (R): | Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. |
| 1. | (A) is False but (R) is True |
| 2. | (A) is True but (R) is False |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: Palentological Evidences of Evolution |
From NCERT
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Consider the given two statements:
| Assertion (A): | Giraffes, in an attempt to forage leaves on tall trees, had to adapt by elongation of their necks. |
| Reason (R): | This elongated neck, an acquired trait, was inherited by their progeny. |
| 1. | (A) is True but (R) is False |
| 2. | (A) is False and (R) is False |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: Theory of Evolution & Lamarckism |
From NCERT
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Consider the given two statements:
| Assertion (A): | Variations on which natural selection acts, arise as a result of random mutations. |
| Reason (R): | A new variation may, or may not, be adaptive. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | (A) is False and (R) is also False. |
| 4. | (A) is True but (R) is False. |
Subtopic: Darwin's Theory |
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From NCERT
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Consider the given two statements:
| Assertion (A): | Evolution can occur if there is genetic variation within a population. |
| Reason (R): | The meaning of EVOLUTION is descent with modification from preexisting species. |
| 1. | Both (A) and (R) are True but the (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True and the (R) correctly explains (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: A BRIEF ACCOUNT OF EVOLUTION |
From NCERT
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