Question
How does the water kept in an earthen pot (matka) become cold during summer?
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What is human immune system? What is a vaccine? How immunisation can be achieved?
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
Which will happen if chloroplast is taken out of the cell and illuminated?
The production of food from animal sources has increased greatly in the last few decades. Justify it.