PHOTOSYNTHESIS TAKES PLACE IN THE CHLOROPLASTS OF PLANT CELLS
1) Chloroplasts are flattened organelles surrounded by a double membrane.
2) Thylakoids (fluid-filled sacs) are stackd up in the chloroplasts into structures called grana (singluar = granum). The grana are linked together by bits of thylakoid membrane called lamellae.
3) Chloroplasts contain photosynthetic pigments (e.g. chlorophyll a, chlorophyll b and carotene). These are coloured substances that absorb the light energy needed for photosynthesis. The pigments are found in the thylakoid membranes - they're attached to proteins. The protein and pigment is called photosystem.
4) Two photosystems are used by plants to capture light energy. Photosystem I (PSI) absorbs light best at a wavelength of 700nm and photosystem II (PSII) absorbs light best at 680nm.
5) Contained within the inner membrane of the chloroplast and surrounding the thylakoids is…