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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: Â Algae |Â Chlorophyceae: Green Algae: I |Â Chlorophyceae: Green Algae: II |Â Chlorophyceae: Green Algae: III |
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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: Â Algae |
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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: Â Algae |
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What makes Red Algae different from Green Algae and Brown Algae?
| 1. | Unlike Green Algae and Brown Algae, Red Algae do not have chlorophyll a. |
| 2. | Unlike Green Algae and Brown Algae, Red Algae have no differentiated cells. |
| 3. | Unlike Green Algae and Brown Algae, Red Algae are not photosynthetic. |
| 4. | Unlike Green Algae and Brown Algae, Red Algae do not have any flagellated stages in their life cycles. |
Subtopic: Â Algae |Â Rhodophyceae: Red Algae and Importance of Algae |
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Subtopic: Â Algae |Â Pteridophytes |
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Identify the correct match:
1. Only I
2. Only II and III
3. Only III
4. I, II and III
| I: | Green algae | 2-8 flagella; equal in length and apical in insertion |
| II: | Brown algae | Food stored as floridean starch |
| III: | Red algae | Pear-shaped gametes bearing two laterally attached flagella |
2. Only II and III
3. Only III
4. I, II and III
Subtopic: Â Algae |
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Match each item in Column-I with one in Column-II and select the correct match from the codes given:
Codes:
| Column-I | Column-II | ||
| A. | The gametes are flagellated and similar in size | P. | Eudorina |
| B. | The gametes are non-flagellated (non-motile) but similar in size | Q. | Ulothrix |
| C. | The female gametes are larger and flagellated, while the male gametes are smaller and flagellated | R. | Fucus |
| D. | One large, non-motile (static) female gamete and a smaller, motile male gamete | S. | Spirogyra |
| A | B | C | D | |
| 1. | S | Q | P | R |
| 2. | Q | S | P | R |
| 3. | Q | S | R | P |
| 4. | S | Q | R | P |
Subtopic: Â Algae |
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Given below are two statements:
| Statement I: | Chlorella is used as food supplement by space travellers |
| Statement II: | Chlorella is a unicellular algae |
| 1. | Both I and II are true and II correctly explains I |
| 2. | I is true and II is false |
| 3. | Both I and II are true but II does not explain I |
| 4. | Both I and II are false |
Subtopic: Â Algae |
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Q. No.
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