Differences between C3 and C4 plants
Popular posts from this blog
Process of Photosynthesis
Photosynthesis is an oxidation-reduction process in which water is oxidized and CO2 is reduced to carbohydrates and water, and O2 molecules are by-products. The reduction of CO2 to carbohydrate level needs assimilatory powers such as ATP and NADPH2 . Reduction of CO2 occurs in dark ( light-independent ) but the production of assimilatory powers takes place in the presence of light and the process is light-dependent. Thus, Photosynthesis consists of two phases : 1. Light-dependent phase (light reaction or Hill reaction) and ` 2. Light-independent phase (dark reaction or Blackman’s reaction).
Structure of Chloroplast
Each chloroplast is surrounded by a double membrane system. The external surface of the outer membrane is smooth whereas the inner membrane is thrown into lamellated structure showing two distinct regions, called Stroma and Grana Lamellae. Stroma Stroma is the main site for the dark reaction of photosynthesis. It forms the matrix (ground substance) of the chloroplast. In the matrix, the lamellae are loosely arranged. The lamellae found in the stroma are called as Stroma Lamellae . Besides these structures, ribosomes and osmophilic granules are also found in the stroma. Besides photosynthesis, lipid, protein, and nucleic acid metabolisms are also found to take place in the stroma region of the chloroplast. Grana Granum (= singular) is the most but complicated portion of the chloroplast. Light reaction of photosynthesis takes place only in the grana region of chloroplasts. About 40-60 grana are present in each chloroplast. In the granum region, the lamellae are compactly arranged j...
Comments
Post a Comment