FORESTRY
ECOLOGY AND ENVIRONMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which gas makes up 78 percent of our atmosphere but can be used by plants only when transformed by bacteria first?
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nitrogen
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oxygen
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hydrogen
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carbon dioxide
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Explanation:
Detailed explanation-1: -Biologically: Nitrogen gas (N2) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH4+), which can be used by plants.
Detailed explanation-2: -Nitrogen gas (N2) makes up nearly 80% of the Earth’s atmosphere, yet nitrogen is often the nutrient that limits primary production in many ecosystems.
Detailed explanation-3: -Nitrogen, a component of proteins and nucleic acids, is essential to life on Earth. Although 78% by volume of the atmosphere is nitrogen gas, this abundant reservoir exists in a form unusable by most organisms.
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