1. A large number of physical and chemical changes are taking place around us. Some of theare natural while some others are due to human activity. Some of these cause pollutionwhile some others are essential for life.Now, answer the following questions :2) In early times, quick lime was used for white-wash. Now a days, use of paints has becomevery common. Do you think it is better in all respects or you think it is not?+) Cooking of food is a chemical reaction. Cooking can be done using cow-dung cakestwood orLPG cylinder or solar cooker or microwave oven. Which one do you think is the best andwhy?) We should eat freshly cut apple. Why?We tell children not to eat too many chocolates. How would you explain to them the mode bywhich their teeth are damaged?
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