Question

Oil Slick causes mass scale death of fishes due to-
A. Clogging of gills
B. Non-availability of oxygen in water
C. Non-availability of food
D. Disruption of food chain

Answer 1

Hint: Death of fishes or exploitation of fishes are common factors in today’s world. Various exploiting issues have been raised while the fishes were killed in large numbers. Fishes are a good diet source of protein. But excessive massive killings of fishes will indeed cause havoc and detrimental effects on the environment. One such major factor is the Oil Slick, oil spilling is a dangerous factor, which causes death of fishes.

Complete Explanation:
 Option A Clogging of gills: oil slick is a layer in the water and sometimes while coming up the surface, fishes drink the oil water leading to clogging of gills. As gills is the mode of respiration in fishes. Hence it causes nothing but death in a large number.
Option A is correct.
Option B Non-availability of oxygen in water: Non-availability of oxygen in water is somewhat true as oil spilling pollutes the water but underwater plants are present in order to clean such toxic wastes. But survival in such conditions is less percent.
Option B is not correct.
Option C Non-availability of food: oil spillage not only degrades the water but also sometimes fish food that is insects, or small fishes, plants. However, it is rare.
Option C is not correct.
Option D Disruption of food chain: aquatic food chain is also an important cycle in nature. If the small fishes continue to die large fishes will ultimately die causing loss of entire aquatic habitat.
Option D is not correct.

Hence, Option A is the correct answer.

Note:
Hence, fish exploitation should be avoided and spillage of oil into water should be strictly prevented. So that, environment can be healthy and we all can get the benefits from it. Each organism be it plant or animal is equally important for our sustainability so, to develop a disease and pollution free environment the laws should be strictly implemented on nature terrorists.