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Q. No.The form and size of algae is highly variable. Which of the following is/are correct?
| I: | Ulothrix is a colonial alga. |
| II: | Volvox is a filamentous alga. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Algae | Chlorophyceae: Green Algae: I | Chlorophyceae: Green Algae: II | Chlorophyceae: Green Algae: III |
88%
Level 1: 80%+
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Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Systematics takes into account evolutionary relationships between organisms. |
| Statement II: | Taxonomy takes into account only some easily observable external characters of organisms. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Systematics & Type study |
60%
Level 2: 60%+
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Agar, a complex polysaccharide with various applications in microbiology and food industry, is commercially derived from:
| 1. | Red algae | 2. | Brown algae |
| 3. | Green algae | 4. | Diatoms |
Subtopic: Rhodophyceae: Red Algae and Importance of Algae |
81%
Level 1: 80%+
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What is not true regarding bryophytes?
| 1. | Zygote undergoes reduction division immediately |
| 2. | Sporophyte is not free living |
| 3. | Haploid spores are produced by meiosis |
| 4. | The sex organs are multi-cellular |
Subtopic: Bryophytes |
79%
Level 2: 60%+
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Artificial systems of classification give equal weightage to vegetative and sexual characteristics which is not acceptable because:
| 1. | Sexual characters are not genetically determined |
| 2. | Vegetative characters are more easily affected by environment |
| 3. | Sexual characters are not easily observable in living beings |
| 4. | Vegetative reproduction is equally common as sexual reproduction |
Subtopic: Classification System |
89%
Level 1: 80%+
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Gymnosperms lack:
| 1. | Secondary growth | 2. | Vessels in their xylem |
| 3. | Albuminous cells | 4. | A dominant sporophyte |
Subtopic: Gymnosperms |
84%
Level 1: 80%+
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| Assertion (A): | Bryophytes have not been very successful on land. |
| Reason (R): | The gametophyte is the dominant stage in the alternation of generation in Bryophytes. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Bryophytes |
81%
Level 1: 80%+
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Algal cell walls are made up of:
| 1. | Cellulose, Galactans, Mannans and Minerals |
| 2. | Cellulose, Hemicellulose, Pectins and Proteins |
| 3. | Cellulose, Pectins, Mannans and Minerals |
| 4. | Cellulose, Hemicellulose, Mannans and Pectins |
Subtopic: Algae |
63%
Level 2: 60%+
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In gymnosperms:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. |
| II: | the male and the female gametophytes do not have an independent free-living existence. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Gymnosperms |
84%
Level 1: 80%+
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Conifers are adapted to tolerate extreme environmental conditions because of
| 1. | presence of vessels | 2. | broad hardy leaves |
| 3. | superficial stomata | 4. | thick cuticle |
Subtopic: Gymnosperms |
83%
Level 1: 80%+
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