Final answer:
A green plant can perform photosynthesis if given water, light, and air. Photosynthesis is the process by which green plants convert carbon dioxide and water into glucose and oxygen using the energy from sunlight.
Step-by-step explanation:
A green plant can perform photosynthesis if given nothing more than water, light, and air. Photosynthesis is the process by which green plants convert carbon dioxide and water into glucose and oxygen using the energy from sunlight. Water is essential for photosynthesis as it provides the hydrogen ions needed for glucose synthesis.