Multiple choice

Phosphorus is generally not reproduced through

  1. Bird's excreta

  2. Decomposition by microorganisms

  3. Heterotrophic bacteria

  4. Zooplanktons excreta

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heterotrophic bacteria, like Desulfavibrio and Acetobacter reduce sulphates to elemental sulphur or sulphides, under anaerobic conditions. Though sulphides are harmful to most organisms, sulphur bacteria oxidise them to sulphate, and brings back the element to cycle.

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