what is the photosynthesis
Answers
Answer:
the process by which green plants prepare their own food by CO2 and water with sunlight and chlorophyll to give O2 and starch as biproducts
photosynthesis is the chemical process by which green plants and other phototrophs synthesise organic compounds from carbon dioxide and water in the presence of sunlight. in plants and most algae it occurs in the chloroplast and there are two principal types of reaction. in the light dependent reactions, which require the presence of light energy from sunlight is absorbed by photosynthetic pigments chiefly the green pigment chlorophyll and used to bring about the photolysis of water. the electrons released by this reaction pass along a series of electron carrier molecules; as they do so they lose their energy which is used to convert ADP to ATP in the process of photophosphorylation. the electrons and protons produced by the photolysis of water are used to reduce NADP. the ATP and and NADPH produced during the light dependent reactions provide energy and reducing power, respectively, for ensuring light independent reactions, formerly called the dark reactions, which nevertheless cannot be sustained without the ATP generated by the light dependent reactions. during these reactions carbon dioxide is reduced to carbohydrate in the metabolic pathway known as the calvin-bassham-benson cycle.
since virtually all the other forms of life are directly or indirectly dependent on plants for food , photosynthesis is the basis for all life on Earth. further more virtually all the atmospheric oxygen has originated from oxygen release during photosynthesis.
