1. Carbon Dioxide (CO2): This gas is taken in from the atmosphere through tiny pores on leaves called stomata.

2. Water (H2O): This is absorbed from the soil through the plant's roots.

3. Light Energy: This is absorbed from sunlight by a pigment called chlorophyll, which gives plants their green color.

4. Chlorophyll: This is a pigment found in chloroplasts, the tiny organelles within plant cells where photosynthesis takes place. Chlorophyll absorbs light energy, which is essential for the process.

These ingredients are combined during photosynthesis to create glucose (C6H12O6), a simple sugar that provides energy for the plant, and oxygen (O2), which is released into the atmosphere.