Answer:
1.) Through the photosynthetic process plants take up carbon dioxide and evolve oxygen. ... Since then, it has been confirmed by various authors that oxygen concentrations in the range 21–100 per cent have a marked inhibitory effect on photosynthesis, particularly at saturating light intensities.
2.) Photosynthesis and cellular respiration are two processes that transform energy and affect concentrations of carbon dioxide and oxygen in air and water.
