The resources which can be used continuously year after year ate called
1). Biotic
2). Abiotic
3). Nonrenewable
4). Renewable
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2. Biofertilizers convert nitrogen to ________ .
3. Catalytic converters are generally made from :
4. What happens when a chemical bond is formed ?
5. The gas used to extinguish fire is
6. The gas dissolved in water that makes it basic is :
7. Type metal used in printing press is an alloy of
8. Which of the following gas was released during Bhopal gas tragedy?
9. Which is the most economical method of removing solid matter from water?