What is the difference between hydrolysis and dehydration synthesis

Dehydration synthesis reactions build molecules up and generally require energy, while hydrolysis reactions break molecules down and generally release energy. The enzymes break down large biological molecules, releasing the smaller building blocks that can be readily absorbed and used by the body.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem