What kind of problem arises when bubbles of nitrogen gas dissolves in blood?

Bends

The correct answer is Option (4) → Bends

Dissolution of nitrogen gas bubbles in the blood causes bends. When a person (especially a deep-sea diver) suddenly moves from high pressure to low pressure, nitrogen dissolved in the blood comes out of solution and forms bubbles in the bloodstream and tissues. These bubbles block blood vessels and cause severe pain in joints and muscles, a condition known as bends or decompression sickness.

Option (1) → Anoxia-  Anoxia is a condition in which the body tissues do not receive sufficient oxygen. It occurs due to lack of oxygen supply, not due to nitrogen bubbles in the blood. Therefore, this option is incorrect.

Option (2) → Red fever - Red fever refers to a disease characterized by fever and redness of the skin. It is not related to the formation of nitrogen gas bubbles in the blood. Hence, this option is incorrect.

Option (3) → Sleeping sickness - Sleeping sickness is a disease caused by the parasite Trypanosoma, transmitted by the tsetse fly. It is an infectious disease and has no connection with nitrogen bubbles forming in the blood during decompression. Therefore, this option is incorrect.

Option 4: Bends - Correct. Formation of nitrogen gas bubbles in blood causes decompression sickness called the bends.