Natural Resources
Air, water, soil, biogeochemical cycles, pollution and conservation.
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Take a full mock →Q1 · Natural Resources · EASY
In the nitrogen cycle, atmospheric nitrogen is converted into ammonia by certain bacteria living in the root nodules of leguminous plants. This process is known as:
Q2 · Natural Resources · MEDIUM
A farmer noticed that after heavy rainfall, the topsoil from his field was being washed away into the nearby stream. Over time, this led to reduced crop yield. Which of the following practices would BEST help prevent this soil erosion?
Q3 · Natural Resources · HARD
A city discharges untreated sewage into a river. Scientists measured dissolved oxygen levels at different points: 8 mg/L upstream (before discharge point), 2 mg/L at the discharge point, and 4 mg/L several kilometers downstream. Fish were found dead near the discharge point. Which of the following BEST explains the pattern of oxygen levels and fish deaths?
Q4 · Natural Resources · MEDIUM
The percentage of nitrogen gas in the Earth's atmosphere is approximately:
Q5 · Natural Resources · HARD
The percentage of nitrogen in the Earth's atmosphere is approximately 78%. Which biogeochemical process is primarily responsible for converting atmospheric nitrogen into compounds that plants can absorb?