CLASS: X NCERT (CBSE)
BIOLOGY
Our Environment
Question 1: A natural phenomenon that becomes harmful due to pollution is _____________.
1. global warming
2. ecological balance
3. greenhouse effect
4. desertification
Answer: 3
Question 2: The pollutant responsible for ozone holes is ____________.
1. CO2
2. SO2
3. CO
4. CFC
Answer: 4
Question 3: One of the best solutions to get rid of non-biodegradable wastes is _________________.
1. burning
2. dumping
3. burying
4. recycling
Answer: 4
Question 4: Animal dung is _________________ waste.
1. biodegradable
2. non-biodegradable
3. hazardous
4. toxic
Answer: 1
Question 5: Which of the following is biodegradable?
1. iron nails
2. plastic mugs
3. leather belts
4. silver foil
Answer: 3
Question 6: Which of the following is non-biodegradable?
1. animal bones
2. nylon
3. tea leaves
4. wool
Answer: 2
Question 7: Name one non-biodegradable waste which may pollute the earth to dangerous levels of toxicity, if not handled properly.
1. DDT
2. CFC
3. Radioactive substances
4. PAN
Answer: 3
Question 8: In a lake polluted with pesticides, which one of the following will contain the maximum amount of pesticides?
1. small fish
2. microscopic animals
3. big fish
4. water birds
Answer: 4
Question 9: Name the substance whose accumulation in pelicans of Lake Michigan led to the formation of thin shells of their eggs.
1. CFC
2. PAN
3. DDT
4. PAC
Answer: 3
Question 10: Name the process in which a harmful chemical enters the food chain and gets concentrated at each level in the food chain.
1. concentration
2. biomagnification
3. expansion
4. pollution
Answer: 2
