. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain

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Study the following statements about ozone

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Name two chemicals used to disinfect water

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Untreated human excreta is a health hazard. Explain

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What is sludge. Explain how it is treated

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Why should oils and fats be not released in the drain. Explain

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What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas

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Drains get blocked by ______ and ______

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Dried _______ is used as manure

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Wastewater released by houses is called____

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Cleaning of water is process of removing___

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Micro-organisms act upon the dead plants to produce

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Which of the following statements is not correct

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Which of the following is not a forest product

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Explain why there is a need of variety of animals and plants in a forest

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Why should we worry about the conditions and issues related to forests far from us

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The decaying leaves and animal droppings in a forest enrich the ____

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