Question 7
Cell and Its EnvironmentUse the diagram (a thistle funnel containing sugar solution, with a membrane tied over the funnel, standing in distilled water) to answer this question.
In plant cells the role of the membrane is played by the
- A.nucleolus.
- B.cell wall.
- C.cytoplasm.
- D.mitochondrion.
Show the answer and explanation
Answer: C (cytoplasm.)
Explanation
The membrane in the funnel is selectively permeable. In a plant cell the cell wall lets everything through; it is the lining of cytoplasm (with the cell membrane and tonoplast) that acts as the selectively permeable membrane.