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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 |
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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%
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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 |
78%
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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 |
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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%
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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%
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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 |
85%
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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%
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Which of the following regarding Cycas is incorrect?
1. Pinnate leaves persist for a few years
2. Male and female cones are born on different plants
3. Coralloid roots are in association with cynobacteria
4. Homosporous gymnosperm
Subtopic: Gymnosperms |
79%
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Which one of the following statements is wrong?
| 1. | Laminaria and Sargassum are used as food. |
| 2. | Algae increase the level of dissolved oxygen in the immediate environment. |
| 3. | Algin is obtained from red algae, and carrageenan from brown algae. |
| 4. | Agar-agar is obtained from Gelidium and Gracilaria. |
Subtopic: Algae |
81%
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