Plants laminar structure

The chloroplasts in green algae and plants are the seat of photosynthessi and producers of glucose-l-P. They are disc-shaped partides 3 to 10 (x in diameter and 1 to 2 p in thickness. It is possible to isolate them from leaves and show that they are bounded by a definite membrane which is semi-permeable. The chloroplasts contain a number of gratia whose diameter varies, according to the type of cell, from 0 2 to 2 (x. A chloroplast contains from 10 to 100 gratia imbedded in a protein matrix. The electron microscope reveals that they have a laminar structure. They contain 33 to 50% protein and also contain lipides. The chloroplasts are auto-reproductive and can divide. 

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