Page 25 - E-Biology Sec.2 2024-2025 U1_Handy

P.O.C Light Reactions Dark reactions

Similarity Both occur during daytime.
Both occur in chloroplast.
Both use enzymes.

Site of occurrence In grana In stroma (matrix)
Limiting factor Temperature
Sunlight Light
What happens in Don’t need it
it Need it
Fixation of CO2 by its combination
Involved process Kinetic light energy + hydrogen on NADPH2 by the
Substrate + help of ATP
Products potential chemical energy
Carbon dioxide fixation
in chlorophyll Carbon dioxide

Photosynthetic phosphorylation PGAL in “glucose, starch, proteins,
lipids, cellular respiration”
Water Water

H2 + NADP NADPH2

Energy stored in ATP

Oxygen (2nd product)

25

First Term