Biogeochemical cycles are an integral part of the biosphere of the world. It gives us information on how all the nutrients, like carbon, nitrogen, Sulphur, and phosphorus, are being recycled in the whole biosphere through the living organisms. Any change in the cycling process means disturbance in the ecosystem. This is one of the most important topics that is to be studied for many competitive exams, such as UPSC, SSC, JKPSC, and JKSSB. This is the reason that we have highly researched and studied all the authentic books and articles and identified the most important and highest chances of questions in the exam regarding the biogeochemical cycles. As it is known, MCQs are the best way of revising, and also having a clear concept regarding the subject does it is advised to go through our MCQs for securing the chance in your upcoming examination.
Which compartments are considered abiotic in biogeochemical cycles that interact with the biosphere of Earth?
A) Hydrosphere, Atmosphere, Lithosphere
B) Only Biosphere
C) Only Oceans and Rivers
D) Soil and Plants
Correct Answer: A) Hydrosphere, Atmosphere, Lithosphere
In the carbon cycle, what process allows plants to absorb atmospheric carbon dioxide and make food?
A) Photosynthesis
B) Respiration
C) Combustion
D) Decomposition
Correct Answer: A) Photosynthesis
During respiration and decomposition, carbon is released back into the environment in what form?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Sulfur
Correct Answer: C) Carbon Dioxide
In the nitrogen cycle, which process converts nitrogen gas into usable ammonia and nitrates for plants?
A) Nitrogen Fixation
B) Denitrification
C) Photosynthesis
D) Erosion
Correct Answer: A) Nitrogen Fixation
What is the main role of microorganisms in biogeochemical cycles within ecosystems on Earth?
A) Driving nutrient cycling
B) Blocking energy flow
C) Stopping respiration
D) Causing extinction
Correct Answer: A) Driving nutrient cycling
Which cycle involves evaporation, condensation, precipitation, and groundwater movement across Earth’s systems?
A) Water Cycle
B) Sulfur Cycle
C) Nitrogen Cycle
D) Rock Cycle
Correct Answer: A) Water Cycle
Which element is important for nucleic acids and phospholipids that make up biological membranes in cells?
A) Nitrogen
B) Phosphorus
C) Sulfur
D) Carbon
Correct Answer: B) Phosphorus
In the sulfur cycle, what process near hydrothermal vents provides energy for deep-sea organisms like tube worms?
A) Oxidation of Sulfur Compounds
B) Photosynthesis
C) Nitrogen Fixation
D) Combustion
Correct Answer: A) Oxidation of Sulfur Compounds
Name the geological process that is responsible for recycling materials in the biogeochemical cycles?
A) Weathering and Erosion
B) Photosynthesis
C) Transpiration
D) Decomposition
Correct Answer: A) Weathering and Erosion
What do we call long-term storage locations, such as coal deposits, in the context of biogeochemical cycles?
A) Reservoirs
B) Pools
C) Exchange Units
D) Energy Flows
Correct Answer: A) Reservoirs
Which gases are mainly released into the atmosphere due to human burning of fossil fuels?
A) Carbon Dioxide
B) Oxygen
C) Nitrogen
D) Helium
Correct Answer: A) Carbon Dioxide
Which part of the planet collectively refers to all living factors, such as plants, animals, and microbes?
A) Biosphere
B) Lithosphere
C) Atmosphere
D) Hydrosphere
Correct Answer: A) Biosphere
What is the mean time frame called in which a substance stays while staying in the reservoir phase when a biogeochemical cycle operates?
A) Residence Time
B) Respiration Period
C) Decomposition Age
D) Photosynthesis Time
Correct Answer: A) Residence Time
Which cycle explains how nutrients like nitrogen and phosphorus run off into the ocean, causing algal blooms?
A) Cultural Eutrophication
B) Water Cycle
C) Carbon Cycle
D) Oxygen Cycle
Correct Answer: A) Cultural Eutrophication
Which process brings carbon from deep geological rocks back to Earth’s surface during mountain formation?
A) Weathering of Rocks
B) Photosynthesis
C) Condensation
D) Respiration
Correct Answer: A) Weathering of Rocks
What type of cycle is considered short-term and occurs within years through biosphere interactions?
A) Fast Biogeochemical Cycle
B) Slow Biogeochemical Cycle
C) Lithosphere Cycle
D) None
Correct Answer: A) Fast Biogeochemical Cycle
What type of cycle can take millions of years, involving tectonic activity and Earth’s crust movements?
A) Slow Biogeochemical Cycle
B) Fast Biogeochemical Cycle
C) Hydrological Cycle
D) Carbon Fixation Cycle
Correct Answer: A) Slow Biogeochemical Cycle
Which two natural processes balance the carbon released and absorbed in the biosphere every year?
A) Photosynthesis and Respiration
B) Combustion and Melting
C) Erosion and Precipitation
D) Nitrogen Fixation and Denitrification
Correct Answer: A) Photosynthesis and Respiration
What is the ultimate source of energy for all the flora and fauna that flows into ecosystems?
A) Sunlight
B) Volcanoes
C) Oceans
D) Mountains
Correct Answer: A) Sunlight
Which human activity has most disrupted natural carbon cycles and increased global climate change problems?
A) Burning Fossil Fuels
B) Natural Photosynthesis
C) Rock Weathering
D) Ocean Currents
Correct Answer: A) Burning Fossil Fuels
Name the biogeochemical cycle that mostly involves the elements of hydrogen and oxygen in their cycling process?
A) Water Cycle
B) Sulfur Cycle
C) Nitrogen Cycle
D) Rock Cycle
Correct Answer: A) Water Cycle
Which organisms form greater than 90% of the total biomass in oceans?
A) Microbes
B) Whales
C) Fish
D) Algae Only
Correct Answer: A) Microbes
Which environmental problem occurs when excessive nitrogen and phosphorus enrichment causes water deoxygenation?
A) Algal Blooms
B) Acid Rain
C) Rock Weathering
D) Carbon Fixation
Correct Answer: A) Algal Blooms
Which of the following elements is critical for maintaining the 3d structure of proteins in living organisms?
A) Sulfur
B) Nitrogen
C) Carbon
D) Oxygen
Correct Answer: A) Sulfur
Which among the following cycles deals with exchanging carbon between the atmosphere, biosphere, oceans, and soil annually?
A) Carbon Cycle
B) Water Cycle
C) Phosphorus Cycle
D) Nitrogen Cycle
Correct Answer: A) Carbon Cycle
