Multiple choice

Sulphur bacteria are:

  1. heterotrophs

  2. autotrophs

  3. chemoautotrophs

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sulphur bacteria are chemoautotrophs because they oxidize inorganic sulfur compounds (like hydrogen sulfide) to obtain energy for synthesizing their organic food. They don't rely on sunlight (photoautotrophs) or consume organic matter (heterotrophs). Option C correctly classifies them.

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