MCQ
The cell wall is freely permeable, but the plasma membrane is ______.
- Asometimes semi-fluid
- Bsometimes freely permeable
- Cimpermeable
- ✓selectively permeable
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| Age | No. of. workers |
| 20 - 30 | 56 |
| 30 - 40 | 39 |
| 40 - 50 | 42 |
| 50 - 60 | 17 |