The lipid content of the cell membrane mainly consists of:
| 1. | Phosphoglycerides | 2. | Cholesterol |
| 3. | Unsaturated fatty acids | 4. | Lipopolysaccharides |
| I: | mainly consists of calcium carbonate |
| II: | holds or glues the different neighbouring cells together |
| III: | is not traversed by plasmodesmata |
| 1. | Only II is correct |
| 2. | Only I is incorrect |
| 3. | I, II and III are incorrect |
| 4. | Only II and III are correct |