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QLDBiologyQuick questions
Unit 3: Biodiversity and the interconnectedness of life
Quick questions on Carbon, nitrogen and water cycles and human impacts (QCE Biology Unit 3)
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the carbon cycle?Show answer
Carbon moves between an atmospheric pool (CO2 and methane), an oceanic pool (dissolved CO2, bicarbonate, carbonate), a lithospheric pool (carbonate rocks, fossil fuels) and a biospheric pool (living and dead organic matter).
What is the nitrogen cycle?Show answer
Nitrogen is the most abundant atmospheric gas (78 per cent of air as N2) but is unusable to most organisms in that form because of the strong triple bond. Specialist microorganisms perform the key transformations.
What is the water cycle?Show answer
Water moves between the atmosphere (water vapour), the hydrosphere (oceans, lakes, rivers, groundwater), the cryosphere (ice and snow) and the biosphere (water inside organisms).
What is q1?Show answer
Describe the role of nitrogen-fixing bacteria in the nitrogen cycle and name two genera commonly found in Queensland legume root nodules. [3 marks]
What is q2?Show answer
A bar chart shows annual carbon flux: photosynthesis 120, plant respiration 60, soil respiration 55, fossil-fuel emissions 10 gigatonnes/year. Calculate net atmospheric change and predict the trend over 50 years. [3 marks]
What is q3?Show answer
Refer to the water cycle in tropical north Queensland. (a) Identify three processes by which water enters the atmosphere. (b) Explain how deforestation affects evapotranspiration.
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