Ans.
Mangrove forest often show a distinct smell like rotten eggs. The reason behind that smell is hydrogen peroxide, which is also known as rotten egg gas. in mangrove forests, hydrogen peroxide is released by various anaerobic bacteria. These bacteria are responsible for the nutrients recycling in these forests as they breakdown the detritus organic matter present in soil and release nutrients for plants.
Thus, the correct answer is 'anaerobic bacteria.'