Mutalism is an interaction that confers benefits to both the interacting species. Two examples where organisms involved are commercially exploited in agriculture are :

1. Mycorrhizae : Represent a close mutpal association, between fungi and the roots of higher plants. Fungi help the plants in absorption of nutrients, specially phosphorus while the plants provide food for the fungus.
2. Lichens : Represent an intimate mutualistic relationship between a fungus and photosynthe-sizing algae or cyanobacteria. Here, the fungus helps in absorption of nutrients and provides protection, while algae prepare the food.