Biogeochemical Cycles
Biology ⇒ Ecology and Environment
Biogeochemical Cycles starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Biogeochemical Cycles.
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See sample questions for grade 9
Describe one way human activities can disrupt the nitrogen cycle.
Describe the process of ammonification in the nitrogen cycle.
Describe the role of bacteria in the nitrogen cycle.
Describe the role of decomposers in the biogeochemical cycles.
Explain how combustion affects the carbon cycle.
Explain how deforestation can affect the carbon cycle.
Explain the difference between evaporation and transpiration.
Explain why biogeochemical cycles are important for ecosystems.
Which human activity increases the amount of carbon dioxide in the atmosphere? (1) Planting trees (2) Burning fossil fuels (3) Photosynthesis (4) Nitrogen fixation
Which of the following is a gaseous biogeochemical cycle? (1) Phosphorus cycle (2) Sulfur cycle (3) Nitrogen cycle (4) Water cycle
Which of the following is a non-renewable source of phosphorus? (1) Animal waste (2) Rock phosphate (3) Plant decay (4) Rainwater
Which of the following is a result of excess phosphorus in water bodies? (1) Eutrophication (2) Acid rain (3) Ozone depletion (4) Global warming
Fill in the blank: The movement of water from the surface to the atmosphere by evaporation and transpiration is called __________.
Fill in the blank: The process by which bacteria convert nitrates back into nitrogen gas is called __________.
Fill in the blank: The process by which plants absorb nitrates from the soil is called __________.
Fill in the blank: The process by which plants lose water vapor through their leaves is called __________.
True or False: Animals obtain phosphorus by eating plants or other animals.
True or False: Nitrogen is essential for the formation of proteins in living organisms.
True or False: Plants absorb nitrogen directly from the atmosphere.
True or False: The carbon cycle involves both living and non-living components of the ecosystem.
