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Write the help of a labelled diagram describe the structure of a chloroplast.
Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.
Why does dehydration set in during diarrhoea? How can the former be prevented.
What is the advantage of using insect resistant varieties?
Write notes on plants and animals as sources of food.