Question

give ultrastructure of chloroplast & explain the significance of photosynthesis?

Answer 1

photosynthesis is a process through which plant make its food with the help of carbon dioxide sunlight and water.

Answer 2

Site of Photosynthesis

Mesophyll cells in green leaves have large number of chloroplasts, which are the site of photosynthesis.

Chloroplast consists of the grana and the stroma lamellae (forming a membranous system) and the fluid stroma.

Membrane system of chloroplast − traps light, and synthesises ATP and NADPH (site of light-dependent reaction of photosynthesis)

Stroma − CO2 is incorporated into the plant by enzymatic reactions, leading to the synthesis of sugar (site of light-independent reaction of photosynthesis)

Chloroplasts are aligned along the walls of mesophyll cells so as to get optimum light.

Chloroplasts (pron.: /ˈklɒrəplæsts/) are organelles found in plant cells and some other eukaryotic organisms. As well as conducting photosynthesis, they carry out almost all fatty acid synthesis in plants, and are involved in a plant's immune response. A chloroplast is a type of plastid which specializes in photosynthesis. During photosynthesis, chloroplasts capture the sun's light energy, and store it in the energy storage molecules ATP and NADPH while freeing oxygen from water. They then use the ATP and NADPH to make organic molecules from carbon dioxide in a process known as the Calvin cycle.

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