Explain the structure of chloroplast with a neat labelled sketch.
1) In green plants there are special membrane bound organelles called chloroplasts.
2) Chloroplasts occur mainly in the mesophyll cells of leaves.
3) Typical chloroplasts are disc shaped and consist of three membranes.
4) The third layer that forms stacked sac-like structures is called grana.
It is the site for trapping of solar energy.
5) In the chloroplast there is fluid filled portion called stroma, responsible for enzymatic reactions leading to the synthesis of glucose, which in turn join together to form starch.
6) These chloroplasts are green in colour because of a pigment called chlorophyll.
7) The chlorophyll and other pigments of the chloroplasts are fat soluble and are located in the liquid part of the thylakoid membrane.