Q. No.Which of the following options most accurately describes algae in general?
| 1. | Algae are chlorophyll-bearing, thalloid, autotrophic and largely aquatic (both fresh water and marine) organisms. |
| 2. | Algae are chlorophyll-bearing, having highly differentiated body, autotrophic and exclusively found in fresh water organisms. |
| 3. | Algae are chlorophyll-bearing or parasitic heterotrophic organisms, thalloid and largely marine organisms. |
| 4. | Algae are chlorophyll-lacking, thalloid, autotrophic and largely saprophytic organisms found in both fresh and marine waters. |
Subtopic: Algae |
94%
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The form and size of algae is highly variable. Which of the following will not be true?
| I: | Volvox is a colonial alga. |
| II: | Ulothrix and Spirogyra do not form filaments. |
| III: | Kelps form massive plants bodies. |
| 1. Only II | 2. Only III |
| 3. Both I and II | 4. Both II and III |
Subtopic: Algae |
83%
From NCERT
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Identify the incorrectly matched pair:
| Alga | Sexual reproduction | |
| I: | Ulothrix | Isogamous; non-flagellated gametes |
| II: | Spirogyra | Isogamous; flagellated gametes |
| III: | Udorina | Anisogamous |
| IV: | Fucus | Oogamous |
| 1. | Only III | 2. | I, II and III |
| 3. | Only I and II | 4. | Only III and IV |
Subtopic: Algae |
75%
From NCERT
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Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Gametes are flagellated and similar in size in Ulothrix |
| II: | Gametes are non-flagellated and similar in size in Spirogyra |
| III: | Gametes are dissimilar in size in Eudorina |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Algae |
91%
From NCERT
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Sexual reproduction takes place through non flagellated gametes that are similar in size in:
| 1. | Ulothrix | 2. | Spirogyra |
| 3. | Volvox | 4. | Fucus |
Subtopic: Algae |
80%
From NCERT
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Subtopic: Algae |
82%
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Fusion of two gametes which are dissimilar in size is termed as
| 1. | Oogamy | 2. | Isogamy |
| 3. | Anisogamy | 4. | Zoogamy |
Subtopic: Algae |
85%
From NCERT
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Algae are useful to man in a variety of ways. Identify the correct statements:
1. Only I, II, III and IV
2. Only I, II, IV and V
2. Only I, II and III
4. Only II, III and IV
| I: | At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis. |
| II: | They are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals. |
| III: | Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. |
| IV: | Agar, one of the commercial products obtained from Gelidium and Gracilaria, are used to grow microbes and in preparations of ice-creams and jellies. |
| V: | Chlorella, a multicellular alga rich in proteins, is used as food supplement even by space travellers. |
1. Only I, II, III and IV
2. Only I, II, IV and V
2. Only I, II and III
4. Only II, III and IV
Subtopic: Algae |
86%
From NCERT
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Which of the following is not an example of an edible alga?
| 1. | Porphyra | 2. | Laminaria |
| 3. | Sargassum | 4. | Amanita |
Subtopic: Algae |
88%
From NCERT
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Consider the given statements:
1. I is correct; II is incorrect; III is incorrect
2. I is incorrect; II is correct; III is correct
3. I is incorrect; II is correct; III is incorrect
4. I is correct; II is incorrect; III is correct
| I: | Algin is a hydrocolloid derived from brown algae |
| II: | Carrageen is a hydrocolloid derived from green algae |
| III: | Agar is a complex polysaccharide derived from red algae, Gelidium and Gracilaria |
1. I is correct; II is incorrect; III is incorrect
2. I is incorrect; II is correct; III is correct
3. I is incorrect; II is correct; III is incorrect
4. I is correct; II is incorrect; III is correct
Subtopic: Algae |
86%
From NCERT
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