Photosynthesis
Biology · प्रकाश संश्लेषण · 15 facts
Photosynthesis: 6CO2+6H2O+sunlight->C6H12O6+6O2 (in chloroplast)
Chlorophyll: green pigment; absorbs sunlight; in chloroplasts
Light reaction: in thylakoids; water splits; O2 released; ATP+NADPH made
Dark reaction(Calvin cycle): in stroma; CO2 fixed into glucose; uses ATP
Plants are autotrophs: make own food using photosynthesis
Photosynthesis: basis of all food chains; produces O2 for life
Factors: sunlight, CO2, water, temperature, chlorophyll
Jan Ingenhousz discovered plants produce O2 in sunlight(1779)
Glucose stored as starch in plants; test with iodine solution(turns blue-black)
Desert plants(CAM): fix CO2 at night; stomata closed during day to save water
Photosynthesis endothermic: absorbs light energy
Global warming: excess CO2 but deforestation reduces photosynthesis
Respiration opposite of photosynthesis: C6H12O6+O2->CO2+H2O+energy
Aquatic plants get CO2 dissolved in water for photosynthesis
Leaves appear green because chlorophyll reflects green light