Question

what is the main function of the cell membrane in a plant cell?
to use energy from sunlight to make sugar

to break down sugar and release energy that the cell can use

to give strength and stiffness to the cell

to control which substances enter and leave the cell

Explanation:

1. Analyze each option:

• "to use energy from sunlight to make sugar" is the function of chloroplasts (photosynthesis), not the cell membrane.
• "to break down sugar and release energy that the cell can use" is the function of mitochondria (cellular respiration), not the cell membrane.
• "to give strength and stiffness to the cell" is the function of the cell wall in plant cells, not the cell membrane.
• "to control which substances enter and leave the cell" is the main function of the cell membrane (selective permeability).

Answer:

to control which substances enter and leave the cell