Multiple Choice Questions on Carbon Cycle:
1. Carbon exists in the atmosphere primarily in the form of:
A. Carbon monoxide only
B. Carbon monoxide and carbon dioxide
C. Carbon dioxide only
D. Methane
Answer: B
2. In an ecosystem, the main form of carbon cycling between the inorganic environment and the biological community is______
A. carbon dioxide
B. Carbonate
C. carbonic acid
d. glucose
Answer: A
3. In the carbon cycle, the human body directly returns carbon to the atmosphere through this way:
A. Formation of glucose
B. Urination
C. Photosynthesis
D. Cellular respiration
Answer: D
4. The source of carbon to plants in the carbon cycle is_________
A. fossil fuels
B. carbonate rocks
C. atmospheric carbon dioxide
D. all of the above
Answer: C
5. The role of bacteria in the carbon cycle is______
A. Breakdown of organic compounds
B. Chemosynthesis
C. Photosynthesis
D. Assimilation of nitrogen compounds
Answer: A
6. Statements about the carbon cycle that are false_______
A. produce greenhouse gases
B. Requires energy to drive
C. Does not depend on water
D. global
Answer: C
7. It is a producer in the ecosystem and belongs to prokaryotes from the perspective of cell structure. It plays an important role in the carbon cycle of the ecosystem.
A. Cyanobacteria
B. bacteria
C. rice
D. Virus
Answer: A
8. Which factor contributes to the carbon cycle
A. fossil fuel combustion
B. respiration
C. photosynthesis
D. all of these
Answer: D
9. In carbon cycle processes, carbon is used by plants to form organic molecules but most carbon is found in the atmosphere as carbon dioxide.
Which process is most responsible for removing carbon dioxide from the atmosphere?
A. Photosynthesis
B. Respiration
C. Combustion
D. Decopmosition
Answer: A
10. In an ecosystem, the process of releasing carbon dioxide into the atmosphere is______
A. photosynthesis
B. respiration
C. dissimilation
D. both B and C
Answer: D
11. The "substance" in the material cycle of the ecosystem refers to_______
A. CO 2
b. Elements that make up the natural world
C. The basic elements that make up living organisms
D. proteins that make up living organisms
Answer: C
12. The process by which carbon sinks remove carbon dioxide (CO2) from the atmosphere is known:
A. carbon absorber
B. carbon chain
C. carbon sequestration
D. carbon well
Answer: C
13. Material cycling in an ecosystem occurs in_______
A. between producers and consumers
B. between different biological communities
C. between producers and decomposers
D. Between community and inorganic environment
Answer: D
14. Respiration and photosynthesis are central to this process_______
A. nitrogen cycle
B. phosphorous cycle
C. carbon cycle
D. sulphur cycle
Answer: C
15. The primary means by which carbon dioxide can be released into the atmosphere to sustain the carbon cycle in any ecosystem is___________
A. The burning of fossil fuels
B. The decomposition of chemical plants releases
C. biological respiration
d. decomposition of carbonate
Answer: C
16. Carbon is found in all organic material. It is used by plants to form organic molecules but most carbon is found in the atmosphere as carbon dioxide. Which of the following processes releases carbon dioxide back into the atmosphere?
I. Decomposition
II. Respiration
Ill. Combustion
A. I only
B. II only
C. I and Ill only
D. I, II and III
Answer: D
17. The role of bacteria in the carbon cycle is________
A. breakdown of organic compounds
B. chemosynthesis
C. photosynthesis
D. assimilation of nitrogen compounds
Answer: D
18. Which of the following is NOT part of the way carbon is returned to the atmosphere in a biome________
A. biological respiration
B. Chemical energy synthesis by some bacteria
C. Decomposition of decomposers
D. Forest fire
Answer: B
19. Which of the following statements about the carbon cycle in the biosphere is false________
A. The carbon cycle is accompanied by the flow of energy
B. Decomposers do not participate in the carbon cycle process in the biosphere
C. Photosynthesis and respiration are closely related to the carbon cycle
D. The predominant form of carbon cycling between biological communities and the inorganic environment is CO2
Answer: C
20. In the carbon cycle, the physiological functions that bring carbon from the inorganic environment into the biological community are
① respiration
② photosynthesis
③ feeding
④ chemical energy synthesis
⑤ nitrification
⑥ denitrification
A. ①②
B. ③④
C. ②④
D. ⑤⑥
Answer: C