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AP SSC important questions Biology- 1st lesson 1. Explain the structure chloroplast with a neatly labelled diagram. Structure of chloroplast 1) The chloroplast is a membranous structure, consisting of 3 membranes. 2) The intermediary fluid filled portion called as stroma is responsible for enzymatic reactions leading to the synthesis of glucose, which in turn join together to for starch. 3) Typical chloroplasts are disc shaped and are filled with colourless area called stroma. 4) They are covered by two membranes. 5) Stacks of thylakoid membranes are located in the stroma and are connected by stroma lamella. 6) Due to the presence of chlorophyll, chloroplasts are green. 7) The chlorophyll pigment is fat soluble and is located in the lipid part of the thylakoid membrane. 8) Chlorophyll is organized to form the reaction centres called photosystem-1 and photosystem-11. 2. Write the difference between light reaction and dark reaction. Ligh