Question

Carbon cycle occurs through

a. Atmosphere
b. Ocean
c. Living organisms
d. Dead organisms

• A. a, b and d
• B. a, b, c and d
• C. a, b and c
• D. a and b

Answer 1

The correct option is B a, b, c and d

Sources of carbon
Carbon is present in the environment in different forms:
(i) Carbon dioxide in air or atmosphere.
(ii) About 71% of the global carbon occurs as dissolved carbon dioxide or carbonic acid and bicarbonate in water.
(iii) Fossil fuels like coal, petroleum and natural gas.
(iv) Carbonate and graphite in the rocks.
(v) Carbon constitutes 49 percent of the dry weight of organisms.
(vi) 4 × 1013 kg per year of carbon is fixed in the biosphere through photosynthesis.

Hence the carbon cycle occurs through the atmosphere, ocean, living and dead organisms.

Final answer
(D) a, b, c and d