Multiple choice

Which of the following bacteria are gram-positive and responsible for the peculiar odour emanating from the soil after rain (petrichor), mainly in warmer climates?

  1. Bacteroidetes

  2. Proteobacteria

  3. Actinobacteria

  4. Spirochetes

  5. Cyanobacteria

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

Actinibacteria is gram-positive. It is responsible for the peculiar odour emanating from the soil after rain (petrichor), mainly in warmer climates. The chemical that produces this odour is known as geosmin.