Human Reproduction Question 200
Question: Water pollution can be stopped best by
Options:
A) Treating effluents to remove injurious chemicals
B) Rearing more fish
C) Cultivating useful water plants
D) Spraying with DDT
Show Answer
Answer:
Correct Answer: A
Solution:
For control of water pollution, sewage oxidation ponds or filter beds or septic tanks or decomposition ponds have been developed.
These oxidation ponds have luxuriant growth of algae and bacteria.
Algae release oxygen and aerobic bacteria break down sewage using this.
BETA
