| I: | Many species of Porphyra, Laminaria and Sargassum are used as food. |
| II: | Hydrocolloids (water holding substances), e.g., algin from red algae and carrageen from brown algae are used commercially. |
| III: | Agar is obtained from Gelidium and Gracilaria. |
| IV: | Chlorella a unicellular alga rich in proteins is used as food supplement. |
| Statement I: | All algae contain chlorophyll a as the primary photosynthetic pigment. |
| Statement II: | All algae reproduce sexually by the production of spores. |
| 1. | Both Statement I and Statement II are true |
| 2. | Statement I is true but Statement II is false |
| 3. | Statement I is false but Statement II is true |
| 4. | Both Statement I and Statement II are false |
| 1. | Cellulose | 2. | Pectin |
| 3. | Chitin | 4. | Algin |
| Column-I | Column-II | ||
| A. | Isogamy | P. | Spirogyra |
| B. | Anisogamy | Q. | Eudorina |
| C. | Oogamy | R. | Volvox |
| A | B | C | |
| 1. | Q | R | P |
| 2. | Q | P | R |
| 3. | P | Q | R |
| 4. | R | Q | P |
| I: | The gametes are flagellated and similar in size in Ulothrix or non-flagellated (non-motile) but similar in size in Spirogyra. |
| II: | Fusion of two gametes dissimilar in size, as in species of Eudorina is termed as anisogamous. |
Porphyra, Sargassum and Laminaria are all:
| I: | brown algae |
| II: | marine edible algae |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect