Question

About 70% of total global carbon occurs in
A. Ocean
B. Forest
C. Agroecosystem
D. Grassland.

Answer 1

The cyclic movement of carbon atoms from the atmosphere to the organism and again to the atmosphere is called the carbon cycle. As the earth and its atmosphere remain in a closed environment, the quantity of carbon remains unchanged. It only travels from one level to another level.

Complete answer:
Ocean: Oceans occupy 70% of the earth’s surface. Carbons are mainly found in the form of organic compounds within living organisms. Carbon is responsible for regulating the temperature of the earth that provides us a life-friendly environment. It is also a major component of our food. The ocean comprises plentiful ecosystems. A major number of living species are found in the oceans. The carbon dioxide content of the oceans is 50% higher than the atmosphere. The majority of the global carbon is stored in the rocks, sediments, living organisms, and in the ocean. Thus it comprises 70% of the global carbon. The ocean is known as the giant carbon sink as it absorbs the majority of the environmental carbon. In the oceans, the carbons travel from the sea surface to the atmosphere by a continuous process.
So, the correct answer is “Option A”.

Note: Carbon is the key component of the earth's life. It is needed to form biological molecules like DNA, proteins, etc. In the atmosphere, carbon is found in the form of carbon dioxide. From the organism, carbon can be released into the atmosphere after its death. Humans contribute a major function in the increase of carbon dioxide into the atmosphere like fossil fuels burning, industrial activities, etc.