Biology
Answer
Two possible causes of the death of many fishes near a sea shore can be:
- Industrial Waste — Large number of industries produces waste water which contains various types of chemical pollutants. Such wastes are commonly discharged into the rivers. These chemicals cause irritation to the body systems of fish.
- Thermal Pollution — Many industries such as thermal power plants, oil refineries, nuclear plants use water for cooling their machinery. This hot waste water may be 8-10°C warmer than the intake water. This hot water is released into the nearby streams, rivers or the sea and causes warming. The sudden fluctuation in the temperature of water kills the fishes and harms the plant life growing in it.
Related Questions
Distinguish between Biodegradable and Non-biodegradable waste
Distinguish between Smoke and smog
Look at the cartoonist's presentation of a kind of pollution given below.
(i) Name the kind of pollution.
(ii) List the sources of pollution.
(iii) Mention any two harmful effects of this pollution.
The following picture depicts a certain phenomenon.
(i) Name the phenomenon and explain it.
(ii) Enlist the sources that are responsible for the above mentioned phenomenon.
(iii) List out the effects of the above phenomenon on humans.