Final answer:
Photo system I is the first photosystem in photosynthesis, responsible for capturing light energy and producing NADPH for carbohydrate production.
Step-by-step explanation:
Photo system I is the first photosystem in photosynthesis, and it is responsible for capturing light energy and converting it into chemical energy.
It is also involved in the production of NADPH, which is used in the Calvin cycle to produce carbohydrates.
Photo system I contains chlorophyll a molecules that absorb light at a wavelength of 700 nm, and it works together with photo system II to carry out the light-dependent reactions of photosynthesis.