What are the reactants for photosynthesis?

The reactants for photosynthesis are carbon dioxide (CO2), water (H2O), and light energy, usually from the sun. Here's the step-by-step process:

1. Carbon Dioxide: Plants absorb carbon dioxide from the air through small pores in their leaves, stems, and roots. This is the main source of carbon for photosynthesis.

2. Water: Plants absorb water from the soil through their roots. This is the main source of hydrogen for photosynthesis.

3. Light Energy: Plants absorb light energy from the sun through their leaves. This energy is used to convert the absorbed carbon dioxide and water into glucose and oxygen.

So, the reactants for photosynthesis are carbon dioxide, water, and light energy.