Carbon Cycle
- Which process in the carbon cycle involves the conversion of CO2 into organic compounds by plants?
a) Decomposition
b) Photosynthesis
c) Combustion
d) Respiration
Answer: b) Photosynthesis - What is the main reservoir of carbon in the Earth’s biosphere?
a) Oceans
b) Fossil fuels
c) Atmosphere
d) Soil
Answer: a) Oceans - Which human activity primarily contributes to the increase of atmospheric carbon dioxide?
a) Agriculture
b) Industrial emissions
c) Deforestation
d) Both b and c
Answer: d) Both b and c - Which organisms play a crucial role in returning carbon dioxide to the atmosphere through decomposition?
a) Producers
b) Decomposers
c) Herbivores
d) Carnivores
Answer: b) Decomposers - Which process in the carbon cycle releases CO2 as a by-product?
a) Respiration
b) Photosynthesis
c) Nitrogen fixation
d) Evaporation
Answer: a) Respiration
Nitrogen Cycle
- What is the process called where atmospheric nitrogen is converted into a usable form by bacteria?
a) Nitrogen fixation
b) Nitrification
c) Denitrification
d) Ammonification
Answer: a) Nitrogen fixation - Which organism is primarily responsible for nitrogen fixation?
a) Algae
b) Cyanobacteria
c) Fungi
d) Insects
Answer: b) Cyanobacteria - The conversion of ammonia into nitrites and nitrates is called:
a) Ammonification
b) Denitrification
c) Nitrification
d) Assimilation
Answer: c) Nitrification - What is the role of denitrifying bacteria in the nitrogen cycle?
a) Convert nitrates to nitrogen gas
b) Fix nitrogen gas into ammonia
c) Decompose organic matter
d) Convert ammonia to nitrites
Answer: a) Convert nitrates to nitrogen gas - Which form of nitrogen can plants directly absorb?
a) Ammonia
b) Nitrogen gas
c) Nitrate
d) Nitrite
Answer: c) Nitrate - Which process contributes to the removal of nitrogen from the atmosphere?
a) Denitrification
b) Nitrogen fixation
c) Evaporation
d) Combustion
Answer: b) Nitrogen fixation - The process by which decomposed organic matter is converted into ammonia is:
a) Nitrification
b) Ammonification
c) Denitrification
d) Assimilation
Answer: b) Ammonification - What happens during assimilation in the nitrogen cycle?
a) Nitrogen gas is converted to ammonia.
b) Plants absorb nitrates to form proteins.
c) Nitrates are converted back to nitrogen gas.
d) Ammonia is converted to nitrites.
Answer: b) Plants absorb nitrates to form proteins.
Water Cycle
- What is the main source of energy that drives the water cycle?
a) Wind
b) Sun
c) Earth’s core
d) Gravity
Answer: b) Sun - The process of water changing from a liquid to vapor is called:
a) Condensation
b) Evaporation
c) Precipitation
d) Transpiration
Answer: b) Evaporation - What is transpiration?
a) Movement of water through the soil
b) Loss of water vapor from plants
c) Formation of clouds
d) Runoff of water into rivers
Answer: b) Loss of water vapor from plants - Which process involves water vapor cooling and changing into liquid?
a) Evaporation
b) Condensation
c) Precipitation
d) Sublimation
Answer: b) Condensation - Rain, snow, sleet, or hail falling from the atmosphere is known as:
a) Runoff
b) Precipitation
c) Evaporation
d) Infiltration
Answer: b) Precipitation - What is infiltration in the water cycle?
a) Water vapor entering the atmosphere
b) Water seeping into the ground
c) Flow of water on the surface
d) Conversion of liquid water to ice
Answer: b) Water seeping into the ground - The continuous movement of water on, above, and below the Earth’s surface is called:
a) Biogeochemical cycle
b) Water cycle
c) Carbon cycle
d) Hydrological shift
Answer: b) Water cycle
General Questions
- Which cycle includes both geological and biological components?
a) Carbon cycle
b) Nitrogen cycle
c) Water cycle
d) All of the above
Answer: d) All of the above - What role do plants play in the carbon cycle?
a) They release carbon dioxide through photosynthesis.
b) They absorb carbon dioxide during photosynthesis.
c) They fix nitrogen into usable forms.
d) They release ammonia into the soil.
Answer: b) They absorb carbon dioxide during photosynthesis. - Which of the following is NOT a greenhouse gas?
a) Carbon dioxide
b) Methane
c) Nitrogen gas
d) Water vapor
Answer: c) Nitrogen gas - How does deforestation affect the carbon cycle?
a) Increases carbon storage
b) Decreases atmospheric CO2
c) Reduces carbon absorption
d) Promotes oxygen production
Answer: c) Reduces carbon absorption - Nitrogen fixation occurs through:
a) Lightning
b) Industrial processes
c) Symbiotic bacteria
d) All of the above
Answer: d) All of the above - The major driving force of the nitrogen cycle is:
a) Solar radiation
b) Microbial activity
c) Human activity
d) Ocean currents
Answer: b) Microbial activity - Which of the following connects all the biogeochemical cycles?
a) Plants
b) Water
c) Animals
d) Soil
Answer: b) Water - What is the term for water moving over the surface of the Earth?
a) Evaporation
b) Runoff
c) Transpiration
d) Sublimation
Answer: b) Runoff - What percentage of Earth’s water is freshwater?
a) 97%
b) 70%
c) 3%
d) 0.3%
Answer: c) 3% - Which of the following does NOT affect the water cycle?
a) Deforestation
b) Urbanization
c) Combustion
d) Agriculture
Answer: c) Combustion
