1. Pumping raw sewage into a river lowers the concentration.

2. Which of the following animals would be found in water next to a sewage outlet?

    stonefly nymph

    mayfly nymph

    bloodworm

    caddis fly larvae

3. Organic waste is a food source for bacteria.

    True

    False

4. A type of organism that only thrives well under certain environmental conditions and whose presence in abundance shows that these conditions are present is called an species.

5. What do we call a chemical used to improve the mineral content of the soil?

6. Sulphur can lead to the formation of acid rain.

7. Which of the following is not a fossil fuel?

    coal

    oil

    solar

    gas

8. What do we call the piece of equipment used to remove sulphur dioxide from smoke?

9. If something is capable of being decomposed by decay microbes, it is said to be .

10. We call the liquid discharged from a sewage works affluent.

    True

    False