In this equation for photosynthesis, where does the second reactant come from and what happens to it in the photosynthesis process?

6CO + 6H O --> C H O + 6O
2 2 6 12 6 2

A. carbon dioxide comes from air and is broke down in the Calvin cycle
B. water is split to drive NADP to NADPH conversion, and it is formed in the Calvin cycle
C. Glucose is formed right after the Calvin cycle
D. oxygen is released as a gas after water is split

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In chloroplasts, light is used to oxidize water to oxygen, and to reduce NADP + to NADPH on the other hand, with concomitant proton injection into the lumen of thylakoids. In the mitochondria, oxygen is reduced to water while NADH is oxidized to NAD + and the succinate is converted to fumarate, with concomitant expulsion of protons out of the mitochondrial matrix.

eurydike eurydike · Answer 2 · 2019-05-05T16:03:32+02:00

Answer:

The second reactant is water and it comes from the root through absorption

The correct choice among the given options is option B, Water is split to drive NADP to NADPH conversion, and it is formed in the Calvin cycle

Explanation:

The second reactant in this equation is water and it comes from the root through absorption.

The water used in the process of photosynthesis is obtained from root which transport the water up to the leaves through the Xylem vessels. In the photosynthesis reaction the water molecule is splitted to produce hydrogen ion and free electrons after receiving the light energy from sun. The free electrons are then taken up by a carrier molecule NADP there by transforming it from NADP+ to NADPH. This step of stablisation of NADP+ to NADPH is a part of calvin cycle.