What is the purpose of a plants cell wall?

The cell wall of plants

- maintains the shape of plant cells
- supports and strengthens plants
- resists water pressure
- controls cell growth
- regulates metabolic processes for the plant
- acts as a physical barrier for the plant
- stores carbohydrates and helps with cell to cell signaling

~From Reference.com

Ibelieve the answer is c. 

Well,what i learned was that unlike many other  endothermic  reactions,  photosynthesis  does not absorb energy as heat. instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. the energy is stored in the glucose molecules, ready to be used when needed.