Light, carbon dioxide, temperature, water
Factors affecting photosynthesis · Biology
Study notes
A potted plant moved from a dark room to a sunny windowsill photosynthesizes faster each day as chlorophyll builds — until light saturates and extra brightness adds nothing. In a greenhouse, raising CO2 to 1000 ppm (from air's 400) can boost tomato yields 30%, which is why commercial growers burn gas or pipe in CO2.