Describe the light reaction of photosynthesis and for both a C3 and a C4 plant tracethe path of carbon dioxide molecule from the point at which it enters a plant to its incorportation into a glucose?

Answer 1

the light reaction consist of two major steps :

1.)harvesting of energy from sunlight or light energy by chlorophyll molecules ; and

2.)conversion of light energy into chemical energy in adenosintriphosphate 9atp)and nicotinamide adenine dinucleotide phosphate (nadph).............

Answer 2

During the light reaction of photosynthesis, light energy is absorbed by chlorophyll in the thylakoid membranes of chloroplasts, leading to the excitation of electrons and the generation of ATP and NADPH.

In a C3 plant, the carbon dioxide molecule enters through small pores called stomata on the leaves and is fixed into a 3-carbon compound during the Calvin cycle in the stroma of the chloroplast.

In a C4 plant, the initial carbon fixation occurs in mesophyll cells to form a 4-carbon compound (oxaloacetate), which is transported to bundle sheath cells where it releases CO2 for the Calvin cycle to take place and form glucose.