BIOINDICATORS

2. occurs through a chemical reaction that produces light energy within an organism's body.
4. act as an early warning system in monitoring changes in soil pollution
5. Indicate the presence of gold in the soil
8. are algae and fungi living symbiotically (they have to live together to survive)
11. Living organisms that respond in an especially clear way to a change environment.
12. is a significant component of biological monitoring programs for assessing water quality.
14. is the increasing concentration of a substance, such as a toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain.
17. is the gradual accumulation of substances, such as pesticides, or other chemicals in an organism.
19. An increase or decrease in an animal population may indicate damage to ecosystem caused by pollution
20. are algae that live in houses made of glass.

1. are a bioindicator, a species ecologists monitor to help gauge how healthy an ecosystem is.
3. indicates sewage and heavy metal pollution of water.
6. are diverse group of organisms found in large quantities and are easier to detect and sample.
7. are often used as bioindicators because they are very sensitive to pollution, excess nutrients, increased turbidity,chlorine etc.
9. bacteria: these are used to test water for environmental toxins
10. are considered accurate indicators of environmental stress and the health of biosphere as a whole
13. it is live in sewage polluted water
15. it is live in slightly polluted water.
16. have been widely documented as useful indicators of environmental water quality because of their differential sensitivity to pollution.
18. the presence or absence of certain plant or other vegetative life in an ecosystem can provide important clues about the health of the environment