10th class science

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Water resources

Why is water essential for maintaining life? Ans-We use water for drinking , bathing , washing , and cooking. With out water we can not think of our daily life. So water is essential for maintaining life. 2. What are the sources of water in villages and cities ? Ans- The people in village get water from wells , ponds and rivers and people in cities are dependent upon municipal taps. There are tube well that supply water at some places. 3. How is  water polluted in village ponds ? Ans- In village some people bathe in ponds . They also wash their clothes there. Even the animals bathe in some ponds. In this way the water is polluted in village ponds. 4.  Howcan we conserve water ? Ans- we can conserve to water to use it wisely . We must always check that the taps water is not being .we should not pollute the water. 5. Why do we need water for irrigation ? Ans- water is essential for growth of crops . We water the plants to enable them to grow. So we need for irrigat...
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Sanitation and diseases (ch-6 science)

1. Give only two ways of disposing dirty waste water. Ans - In cities pipes are used for carrying away the waste water. Sewage pipes are laid underground for this purpose. 2. How do the germs enter our body ? Ans- Mostly through food and drink for example bread on garbage which has germs. The germs stick to their legs. When they sit on exposed food articles ,they carry the germs to the food. 3. Give three methods to check breeding of mosquitoes. Ans- keep the drains clean.          All water tanks should be covered. Keep the cooler dry when not in use. 4. What is dehydration? Ans- Loss of excess of water and salts from the body causes dehydration. 5. What do you understand by ORS ? Ans- ORS (Oral Rehydration Solution) should be given to a patient suffering from diarrhoea. 6. Give two preventive measures against diarrhoea. Ans- Keep food properly covered. Use boiled water for drinking. 7. How is compost formed ? Ans- All the waste an...
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