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Nitrogen is essential for burning.
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Which gas is essential for burning?
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What was the old name of nitrogen?
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What is the presence of harmful substance in the air called?
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Write a note on nitrogen.
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Explain carbon dioxide and its uses.
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______ of our brain’s mass consists of water.
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The Antartic region has about ______ of the worlds fresh water.
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______ is the chemical formula of water.
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Each day, we lose a little more than a cup of water when we ______.
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1 inch of rainfall on a 2000 sq. ft. roof is equal to 4,800 liters of water.
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How will you construct a rainwater harvesting pit?
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How many kidneys does the human body have?
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The main function of the kidney is ______.
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How many bone are there is a newly born infant?
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Earlier people cooked their food in pressure cooker. __________
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Look at the pictures given below. Which one is good for health? Why?
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