Q. No.Subtopic: Â Algae |
 98%
Level 1: 80%+
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Subtopic: Â Algae |
 98%
Level 1: 80%+
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Algae are useful
| 1. | Because at least half of the total carbon dioxide fixation on Earth is carried out by algae through photosynthesis. |
| 2. | Algae being photosynthetic can increase the level of dissolved oxygen in their immediate environment |
| 3. | They are primary producers of energy rich compounds and form the basis of the food cycles of all aquatic animals |
| 4. | All of the above |
Subtopic: Â Algae |
 97%
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Hydrocolloid is
| 1. | Water soluble substance |
| 2. | Water holding substance |
| 3. | Hydrogen gas containing substance |
| 4. | Oxygen gas containing substance |
Subtopic: Â Algae |
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Choose the correct statement.
| 1. | Many species of Porphyra, Laminaria and Sargassum and among 70 species of marine algae used as food. |
| 2. | Agar is used to grow microbes and in preparations of ice creams and jellies. |
| 3. | Algae are useful to man in a variety of ways. |
| 4. | All of these. |
Subtopic: Â Algae |
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Match List-I with List-II
Choose the correct answer from the options given below:
1. A-IV, B-II, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-III, B-II, C-I, D-IV
4. A-IV, B-I, C-II, D-III
| List-I | List-II | ||
| A. | Ulothrix | I. | Anisogamy |
| B. | Spirogyra | II. | Oogamy |
| C. | Eudorina | III. | Isogamy, flagellated similar in size gametes |
| D. | Fucus | IV. | Isogamy, non-flagellated similar in size gametes |
1. A-IV, B-II, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-III, B-II, C-I, D-IV
4. A-IV, B-I, C-II, D-III
Subtopic: Â Algae |
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Carrageen
| 1. | Water holding substance |
| 2. | Obtained from red algae |
| 3. | Sulfated water holding substance |
| 4. | All of these |
Subtopic: Â Algae |
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Which pigment is predominantly found in red algae and contributes to their distinctive coloration?
1. Chlorophyll a
2. Phycoerythrin
3. Carotenoids
4. Xanthophylls
1. Chlorophyll a
2. Phycoerythrin
3. Carotenoids
4. Xanthophylls
Subtopic: Â Algae |Â Rhodophyceae: Red Algae and Importance of Algae |
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Which option includes only organisms that are red algae and are sources of agar?
1. Ulva, Spirogyra
2. Sargassum, Laminaria
3. Gelidium, Gracilaria
4. Chara, Nitella
1. Ulva, Spirogyra
2. Sargassum, Laminaria
3. Gelidium, Gracilaria
4. Chara, Nitella
Subtopic: Â Algae |
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Plants which are not differentiated into roots, stems and leaves are
| 1. | Algae | 2. | Gymnosperms |
| 3. | Pteridophytes | 4. | Angiosperms |
Subtopic: Â Algae |
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