Same chapter3 marksDifficulty: Medium
What is protoplasm, and why is it called the physical basis of life?
Basic Biology: The Cell
3 marksDifficulty: Medium
Why is the plasma membrane described as selectively permeable?
Original Khojo Papers practice question — not from a past board paper.
Answer
The plasma membrane allows some substances to pass through it while holding others back, so the cell can control what enters and leaves. Small molecules such as water and oxygen pass freely, while larger molecules and most ions cross only through specific channels or carriers.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
This control is what keeps the internal composition of the cell different from its surroundings.
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