The excessive amount of nutrients creates problems such as…………..
a) excessive growth of algae
b) decrease in dissolved oxygen in water
c) effects aquatic animals
d) all of these
Pesticides affect and damage the ………….
a) liver
b) reproductive system
c) both a & b
d) none of these
……can alter the ecology of aquatic habitats
a) oil
b) petrochemical
c) both a & b
d) none of these
In children, mercury causes…………..
a) brain damage
b) learning defects
c) incomplete mental development
d) all of these
In adults, ………causes Parkinson’s disease and Alzheimer’s disease.
a) mercury
b) lead
c) zinc
d) sodium
The hot water………the solubility of oxygen.
a) decrease
b) increase
c) maintain
d) stop
