Photosynthesis in Higher Plants

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Photosynthesis is the light energy trapping process that converts light energy into chemical energy. This chemical energy becomes the ultimate source of food for almost all living organisms. In green …

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It is the main process that stores solar energy in food molecules. Since almost all food chains begin with plants or other photosynthetic organisms, most living organisms depend on photosynthesis dire…

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Stephen Hales recognised the importance of air and light in the nourishment of plants in 1727. His work was one of the early steps in understanding photosynthesis.

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Van Helmont grew a willow seedling in weighed soil and gave only rainwater for five years. The willow gained a lot of mass while the soil lost very little dry weight. He concluded that water, not soil…

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Priestley showed that air contaminated by a burning candle could not support life in a mouse, but a sprig of mint grown in the same air made it pure again so that the mouse could live. He concluded th…

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Jan Ingen-Housz showed that light and green parts of plants are needed for purification of noxious air, and that only the green parts release oxygen.

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Jean Senebier showed that only the green parts of a plant purify air and was the first to clarify that fixed air, or carbon dioxide, is important in photosynthesis.

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Chloroplast is the site of photosynthesis in higher plants. It contains the pigment system, thylakoids, grana, and stroma needed for light reactions and dark reactions.