CBSE Guess > Papers > Important Questions > Class X > Science > Environment and Environmental Problems Environment and Environmental Problems Q. 233. Write the importance of ozone layer. Q. 234. How carbon monoxide is produced in at mosphere? How is it harmful to man? Q. 235. What is air pollution? Write the processes that cause air pollution. Q. 236. What is smog? Name any two disease caused by smog. Q. 237. What are occupational hazards. Write their symptoms. Q. 238. Write the major pollutants of water and their sources. Q. 239. Distinguish between biodegradable and non-biodegradable wastes. giving examples. Q. 240. Which of the following are biodegradable? Q. 241. How is ozone layer formed?
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