There are numerous species of plants all over the world.Some have adapted to desert conditions while other have adapted to cold climates.
The light-dependent reactions and the Calvin Cycle are the two main stages of photosynthesis in plants.
Light-dependent Reactions The first stage of photosynthesis is the light dependent reactions.
Carbon dioxide is absorbed from the atmosphere through pores in the leaves called stomata. Most of the reactions involved in the process of photosynthesis take place in the leaves.
The leaves also contain chloroplasts which hold chlorophyll. The diagram below shows the cross section of a typical plant leaf.
Water is absorbed from the soil into the cells of roots.
The water passes from the root system to the xylem vessels in the stem until it reaches the leaves.The three types of photosynthesis are C3, C4 and CAM photosynthesis.The definition of photosynthesis and the general equation can be found under Overview of Photosynthesis.This means that the steps above would have to be repeated five more times to produce ten additional molecules of G3P.Two molecules of G3P will be used to produce glucose and the other ten will be used for the regeneration of Ru BP.It is an endothermic (takes in heat) chemical process that uses sunlight to turn carbon dioxide into sugars that the cell can use as energy.As well as plants, many kinds of algae, protists and bacteria use it to get food.The chlorophyll molecules of PSI absorb light with a peak wavelength of 700nm and are called P700 molecules.The chlorophyll molecules of PSII absorb light with a peak wavelength of 68Onm and are called P68O molecules. Light-dependent Reactions Animation The Calvin Cycle The second stage of photosynthesis is the Calvin Cycle.Photosynthesis occurs in the Chloroplast (found in leaf cells) and contain Chlorophyll, the green pigment that absorbs light energy.Palisade cell has numerous chloroplasts to maximise the absorption of light.