Which of the following group of bacteria plays a great role in recycling nutrients?

Nutrient recycling in ecosystems is primarily facilitated by certain groups of bacteria known as decomposers or saprophytic bacteria. Among various groups of bacteria, the following are particularly significant in nutrient recycling:

1. Nitrogen-fixing bacteria: These bacteria, such as Rhizobium, convert atmospheric nitrogen into forms that plants can absorb and utilize. This process is crucial in maintaining nitrogen levels in the soil.

2. Nitrifying bacteria: Bacteria like Nitrosomonas and Nitrobacter are involved in the nitrification process, where ammonia is converted into nitrites and then into nitrates, making nitrogen accessible for plant uptake.

3. Denitrifying bacteria: Such as Pseudomonas and Bacillus, these bacteria convert nitrates back into nitrogen gas, returning nitrogen to the atmosphere and closing the nitrogen cycle.

4. Decomposers: Bacteria that break down dead organic matter, recycling carbon and other nutrients back into the ecosystem. Examples include Bacillus and Clostridium.

Each of these groups plays a critical role in maintaining nutrient balance and supporting plant growth, thus contributing to the health of ecosystems.