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Dark Reaction in Photosynthesis
. The chemical reaction by which plants produce complex food molecules (sugars) requires an energy input (i.e., from sunlight) to occur. In this reaction, carbon dioxide and water combine to form carbon-based organic molecules and release oxygen. (Boundary: Further details of the photosynthesis process are not taught at this grade level.)
Dark reaction is the second stage in the process of photosynthesis with the first one being the light reaction. The concept of dark reaction in photosynthesis was initially explained by Blackman. It is thus also known by the name Blackman’s reaction. This is basically the stage wherein the chemical process of photosynthesis takes place without the use of sunlight. The reaction occurs in the stroma of the chloroplast. The process is comparatively slower than the light reaction and is exclusively enzymatic.
Light and Dark reactions in photosynthesis ppt - WizIQ
The products of dark reaction of photosynthesis are sugar molecules and organic molecules that are essential for functioning of the cell and metabolism.
Before we elaborate on dark reaction in photosynthesis, let us understand as to what exactly is the process of photosynthesis. It is basically a process employed by plants and other organisms for the conversion of light energy into chemical energy. They use sunlight for synthesizing nutrients from carbon dioxide and water. In plants photosynthesis mainly involves the green pigment chlorophyll. It exudes oxygen as a by-product. The energy generated is later released to fuel the activities of the organisms.
A summary of Light and Dark reactions in photosynthesis
While the dark reaction in photosynthesis is light independent reaction, light reaction, on the other hand, is dependent on light. Dark reaction of photosynthesis takes place in the stroma of living chloroplast. Light reactions take place in chloroplasts’ thylakoid membranes in a leaf. In dark reaction in photosynthesis, C3 pathway is noticed in green plants and C4 pathway is observed in desert plants. In light reaction in photosynthesis, the cyclic and non-cyclic photophosphorylation takes place in the cells.
Dark reactions make use of these organic energy molecules (ATP and NADPH). This reaction cycle is also called Calvin Benison Cycle, and it occurs in the stroma. ATP provides the energy while NADPH provides the electrons required to fix the CO2 (carbon dioxide) into carbohydrates.
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What is Dark Reaction in Photosynthesis? | Etoosindia
Naturally occurring food and fuel contain complex carbon-based molecules, chiefly derived from plant matter that has been formed by photosynthesis. The chemical reaction of these molecules with oxygen releases energy; such reactions provide energy for most animal life and for residential, commercial, and industrial activities.
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