Biogeochemical Cycles
Biology ⇒ Ecology and Environment
Biogeochemical Cycles starts at 8 and continues till grade 12.
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See sample questions for grade 11
Describe how volcanic eruptions can influence the carbon cycle.
Describe one way in which human activities have altered the carbon cycle.
Describe the process of ammonification in the nitrogen cycle.
Describe the process of denitrification and its ecological significance.
Describe the role of oceans in the carbon cycle.
Explain how deforestation can affect the carbon cycle.
Explain the impact of eutrophication on aquatic ecosystems.
A lake receives runoff from nearby agricultural fields that contain high levels of phosphate fertilizers. Over time, the lake experiences a rapid increase in algal growth, followed by a decline in fish populations. Explain the biogeochemical processes responsible for these changes.
Which of the following is a consequence of disrupting the phosphorus cycle?
(1) Increased greenhouse effect
(2) Eutrophication of water bodies
(3) Ozone layer depletion
(4) Acid rain
Which of the following is a direct result of excessive use of fertilizers containing nitrogen and phosphorus?
(1) Eutrophication
(2) Desertification
(3) Acid rain
(4) Ozone depletion
Which of the following is a process unique to the phosphorus cycle?
(1) Weathering of rocks
(2) Photosynthesis
(3) Respiration
(4) Transpiration
Which of the following is a reservoir for phosphorus in the environment?
(1) Atmosphere
(2) Rocks
(3) Oceans
(4) Plants
Fill in the blank: The largest reservoir of carbon on Earth is __________.
Fill in the blank: The movement of water from the surface into the ground is called __________.
Fill in the blank: The process by which bacteria convert atmospheric nitrogen into ammonia is called __________.
Fill in the blank: The process by which plants absorb nitrate from the soil is called __________.
True or False: All biogeochemical cycles are closed systems on Earth.
True or False: All living organisms require nitrogen to build proteins and nucleic acids.
True or False: Lightning can contribute to nitrogen fixation in the atmosphere.
True or False: Nitrogen fixation can only occur through biological processes.
