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  • Created by: charlotte
  • Created on: 21-01-11 11:05

Describe the structure of chloroplasts in relation to their role in photo synthesis..

The site of photo synthesis is the chloroplast. A palisade mesophyll cell in a leaf can contain up to 50 chloroplasts.. each chloroplast is made up of membranes , arranged in a precise , organised way..

Thylakoid membranes are a system of interconnected flattened fluid filled sacs. Proteins , including photo synthetic pigments and electron carriers , are embedded in the membranes . And envolved in the light - dependent reactions..

The stroma is the fluid surrounding the Thykaloid membranes. It contains all the enzymes needed to carry out the light - independent reactions of photo synthesis..

Thykaloid space - Fluid within the thykaloid membrane sacs contains enzymes for photolysis.

Granum - a stack of thykaloids joined to one another. Grana resemble stacks of coins. .

A smooth inner membrane - containing many transport molecules. These are membrane proteins which regulate substances in and out of the chloroplast..

A smooth outer membrane - which is freely permeable to molecules such as carbon dioxide and water..

Describe The light dependent reactions of photo synthesis..

The Energy from the sun excites chlorophyll molecules., High energy electrons leave the chlorophyll and pass along a series of carrier proteins in the electron transport chain.. the ionised chlorophyll causes the photolysis of water; hydrogen is pulled off water molecules raising the local hydrogen ion concentration within the thykaloid.. A T P is also formed as a phosphate group is added to ADP.




thank you :)

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