Light Dependent And Light Independent Reactions

The thylakoid membrane absorbs photon energy of different wavelengths of light.

Light dependent and light independent reactions. To begin with water is taken up by the roots and circulated by veins to the leaves. Reactions of photosynthesis that use energy from light and water to produce atp and oxygen that is released into the atmosphere calvin cycle light independent reactions plants use atp and co2 to produce high energy sugars such as glucose. The calvin cycle light independent reactions bio synthetic phase dark reactions or photosynthetic carbon reduction pcr cycle of photosynthesis are the chemical reactions that convert carbon dioxide and other compounds into glucose these reactions occur in the stroma the fluid filled area of a chloroplast outside the thylakoid membranes these reactions take the products atp and nadph. The calvin cycle is not totally independent of light since it relies on atp and nadh which are products of the light dependent reactions.

Both together are the source of the biochemical energy that other plants and animals use to survive. Here is an explanation in technical terms. The light independent reactions of photosynthesis are the four reactions that take place in the later part of the photosynthesis process. In light dependent reactions the first stage of photosynthesis the energy from light propels electrons into a high energy state.

The actual fixation of carbon dioxide which diffuses into the leaf from the atmosphere occurs by a cyclic series of reactions called the calvin cycle named after one of the pioneer researchers in this area a summary of the calvin cycle is illustrated in. Also known as the calvin cycle the four steps of the light independent or dark reactions are carbon fixation reduction carbohydrate formation and regeneration of the initial enzymes. The process of photosynthesis is made up of light dependent reactions the photo part and sugar making or light independent reactions the synthesis part. Light dependent reactions harness energy from the sun to produce chemical bonds atp and nadph.

There are four major protein complexes in. The light independent reactions can proceed once products nadph and atp of the light dependent reactions are present in the chloroplast. These light dependent reactions fuel the second stage of photosynthesis which are the light independent reactions. The light dependent and light independent reactions previous next previous next.

While the dark reactions don t need light they do need the continuous supply of nadph and atp from the light dependent reactions.