The process of taking in oxygen and releasing carbon dioxide is called: MCQ with Answer and Explanation

The process of taking in oxygen and releasing carbon dioxide is called:
A. Excretion
B. Respiration
C. Circulation
D. Digestion
Answer: Option B
Solution (By JKSSB Mock Tests)
Respiration includes external respiration (breathing, gas exchange) and internal respiration (cellular metabolism). Digestion is food breakdown, circulation is transport, excretion is waste removal.

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Practice More Biology Questions

Question #1
The protein that polymerizes to form blood clots is:
A. Prothrombin
B. Fibrinogen
C. Thrombin
D. Fibrin

Correct Answer: Option D


Explanation:
Thrombin converts soluble fibrinogen into insoluble fibrin monomers, which polymerize and cross-link to form a stable blood clot. Fibrinogen is the precursor, prothrombin is the precursor of thrombin. The clotting cascade amplifies the signal.

This question belongs to: Science Biology
Question #2
In the context of environmental pollution, 'Minamata disease' in Japan was caused by the severe contamination of water with:
A. Lead
B. Methylmercury
C. Cadmium
D. Arsenic

Correct Answer: Option B


Explanation:
Minamata disease is a severe neurological syndrome caused by severe mercury poisoning. It was first discovered in Minamata city, Kumamoto prefecture, Japan, in 1956. It was caused by the release of methylmercury in the industrial wastewater from the Chisso Corporation's chemical factory, which contaminated the local bay and the fish and shellfish. People who consumed the contaminated seafood suffered from severe neurological damage, including ataxia, numbness, and muscle weakness.

This question belongs to: Science Biology
Question #3
The process by which atmospheric CO₂ is fixed into organic compounds by plants is:
A. Combustion
B. Photosynthesis
C. Decomposition
D. Respiration

Correct Answer: Option B


Explanation:
Photosynthesis converts CO₂ and water into glucose using light energy, fixing carbon. Respiration releases CO₂, combustion burns organic matter, decomposition breaks down dead matter. Photosynthesis is the main route of carbon entry into the biosphere.

This question belongs to: Science Biology