photosynthesis The process by which plants and other photoautotrophs generate carbohydrates and oxygen from carbon dioxide, water, and light energy.
An autotroph or "producer", is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.
A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. Heterotrophs can be further divided based on how they obtain energy; if the heterotroph uses light for energy,
Photosystems are functional and structural units of protein complexes involved in photosynthesis that together carry out the primary photochemistry of photosynthesis: the absorption of light and the transfer of energy and electrons.
C3 plants are those which fix and reduce inorganic CO2 into organic compounds using only the C3 pathway in photosynthesis
C4 plants that fix carbon dioxide during the night. They store it as 4 carbon malate, releasing carbon dioxide during daylight when the light dependent reactions of photosynthesis can take place.
CAM pathway Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions.
source : wikipedia
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