Oil slick causes mass scale death of fish due to

Clogging of gills

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Non-availability of oxygen in water

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Non-availability of food

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Disruption of food chain

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Solution

The correct option is C Clogging of gills
An oil slick refers to the the film of oil floating on the sea or ocean waters, released due to ship accidents. This have a wide range on ill effects on the aquatic life. However, fishes are the worst sufferers as the oil moves into their gills while they take in water for respiration. The oil stays in the gills capillaries and clogs them from extracting out the oxygen from the water. This results in the suffocation of the internal organs and death.
Hence, the correct answer is 'Clogging of gills'

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Similar questions

Q2. Consider the following statements regarding food grains production in India

i, Total amount of food grains production has increased

ii. Per-capita availability of food grains has increased

iii. Per-capita availability of food grains has decreased

iv. Total amount of food grains production has decreased

Identify the correct statements

Rickets, scurvy and beriberi are deficiency diseases which appeared mainly due to the non-availability of proper food.

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