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  • Created by: laraax123
  • Created on: 26-09-15 23:02


Photosynthesis occurs in the chloroplasts of plant cells.Chloroplasts are small,flattened organelles found in plant cells. They have a double membrane called the chloroplast envelope. Thylakoids are stacked up in the chloroplasts into structures called grana. The grana are linked together by bits of thylakoid membrane called lamellae.

Chloroplasts contain PHOTOSYNTHETIC PIGMENTS.(chlorophyll a ,chlorophyll b and carotene)These absorb light needed for photosynthesis.The pigments are found in the thylakoid membranes, theyre attached to protiens. The protein and the pigment are called PHOTOSYSTEM.

PRIMARY PIGMENTS:reaction centres where electrons are excited during the light-dependent reactions (mostly chlorophyll a).      

ACCESSORY PIGMENTS: surround the primary pigments and transfer light energy to them.

PHOTOSYSTEM 1 (PSI): absorbs light best at a wavelength of 700nm 



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