21. What are the characteristics of an ideal fuel?
22. How can you prevent air pollution?
23. Write the ways to protect your eyes.
24. What is deforestation? Discuss the consequences of deforestation.
Answers
Answer:
a)(1) it should have high calorific value so that high amount of energy available by burning lower quantity of fuel.
(2) easy to store and transport.
(3) it should not produce any poisionous and polluting gases while burning.
(4) it should not leave any harmful residue and tar after burning.
b)Ways to Reduce Air Pollution
Riding a bike or walking instead of driving.
Taking a bus or carpooling.
Buying a car that has greater fuel efficiency.
Turning off lights and appliances when they are not in use.
Using energy efficient light bulbs and appliances.
Buying fewer things that are manufactured using fossil fuels.
c)Wear Sunglasses with Complete Ultraviolet Protection. ...
Use Goggles at the Pool. ...
Wash Hands and Avoid Rubbing Your Eyes. ...
Wear Hats. ...
Protect Against Chemicals. ...
Keep Children Safe and Start Young with Eye Protection. ...
Wear eye protection during outdoor activities. ...
Eat Healthy and Drink Plenty of Water.
d)Deforestation refers to the removal of trees resulting in cleared land. ... Loss of nutrients in the soil that are derived from breakdown of tree leaves. Increased soil erosion by wind and rain. Increased flooding due to a lack of water absorption by trees. Decreased ability to support other plants due to nutrient loss.
Explanation:
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