Light Reactions

Supplement the light reactions take place on the thylakoid membranes of the chloroplast the light reactions may either be cyclic or non cyclic.

Light reactions. Definition noun the series of biochemical reactions in photosynthesis that require light energy that is captured by light absorbing pigments such as chlorophyll to be converted into chemical energy in the form of atp and nadph. Light reaction synonyms light reaction pronunciation light reaction translation english dictionary definition of light reaction. In photosynthesis the light dependent reactions take place on the thylakoid membranes the inside of the thylakoid membrane is called the lumen and outside the thylakoid membrane is the stroma where the light independent reactions take place the thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions. The chloroplasts are double membraned cell organelles that are comprised of stacked disc like structures known as thylakoids.

The light reaction of photosynthesis initiates only when it is supplied with light energy. Any of the chemical reactions that take place as part of the first stage of photosynthesis and require the presence of light by which energy captured. Dark reactions make use of these organic energy molecules atp and nadph. Light reactions need light to produce organic energy molecules atp and nadph.

This reaction cycle is also called calvin benison cycle and it occurs in the stroma. There are four major protein complexes in. When light strikes chlorophyll or an accessory pigment within the chloroplast it energizes electrons within that molecule. They are initiated by colored pigments mainly green colored chlorophylls.

The light reaction is a light dependent process which includes a series of events such as light absorption hydrolysis the release of oxygen formation of atp and nadph. Light is the source of energy for photosynthesis and the first set of reactions which begin the process requires light thus the name light reactions or light dependent reactions. The pigment chlorophyll which is required for the process is present on the membrane of these thylakoids and this is where the light reaction occurs.