Question

what is the main function of the cell membrane in a plant cell?
to break down sugar and release energy that the cell can use
to use energy from sunlight to make sugar
to contain the information that the cell uses for growth and activities
to control which substances enter and leave the cell

Explanation:

The cell membrane is a semi - permeable barrier. It has the property of selective permeability. This means it can distinguish between different substances. For example, it allows essential nutrients like glucose (when the concentration gradient is favorable) to enter the cell. At the same time, it can prevent harmful substances from entering. Also, it can regulate the exit of waste products such as carbon dioxide (in the case of plant cells during respiration) from the cell.

Answer:

to control which substances enter and leave the cell