What is a base?
a. a substance that can donate an h+ ion

b. a substance that has a low ph value

c. a substance that is alkaline

d. a substance that can accept an oh– ion

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material