For photosynthesis to occur, plants need: · Light energy from the sun · Chlorophyll to absorb light energy · Carbon dioxide from the atmosphere and from respiration in plant cells · Water which is absorbed by the roots and transported to the leaves by the xylem tubes....
Photosynthesis is the process by which phototrophs convert carbon
dioxide and water into simple carbohydrates and oxygen in the presence
of chlorophyll, using sunlight.
Copper participates, as part of the plastocyanin molecules, in the electron transport during photosynthesis, and as co-factor in a number of enzymatic reactions and metabolic pathways (Bidwell, 1979; De Boer, 1981; Lobban et al., 1985).
Carbon dioxide is trapped and reduced to carbohydrate in the
light-independent reactions of photosynthesis, using ATP and reduced
NADP from the light-dependent reactions.
During these reactions the photosynthetic pigments of the chloroplast
absorb light energy and give out excited electrons used to synthesise
Carbon dioxide from the air combines with ribulose bisphosphate
(RuBP), a 5-carbon compound which fixes the carbon dioxide by
accepting it and making it part of the photosynthetic reactions.
The whole process
takes place all the time during the hours of daylight, but only the
light-independent reactions of photosynthesis are sometimes referred
as the dark reactions (however this does not mean they only occur in
the dark, where as in fact they occur continuously).
Thus the reactions of the light-dependent stage of photosynthesis
provide a source of reducing power (NADPH) and the universal
energy-supplying molecule ATP, with oxygen gas given off as a waste