AQA A-Level Biology 2025/6

Biology • A-Level

Question 1 of 41

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Which group of organisms is chiefly responsible for converting the organic nitrogen in dead plant and animal material into inorganic ammonium that can be absorbed by plants in an ecosystem?

Hint: Consider which organisms are involved in the breakdown of dead matter to release nutrients.

Denitrifying bacteria that reduce nitrate to nitrogen gas Decomposers such as bacteria and fungi Nitrogen‑fixing bacteria associated with legume roots Nitrifying bacteria that oxidise ammonium to nitrate

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