There are many different Mutualistic relationships between plants and other organisms in the Savanna biomes. Examples are shown below.
There is the relationship with termites and the Jackal Berry Tree. The relationship is where the heavy soils of the termite mounds provide a good source of moisture for the tree and in return the trees roots will provide protection for the termites from other predators.
Another mutualistic relationship in the Savanna is the relationship between an acacia tree and ants. At the bottom of the thorns there are hollow lumps which the ants can use as a hive. And in return the ants will protect it from any predators, for example if a giraffe started to eat the acacia trees leaves then the ants would come out of their hive and start irritating the giraffe. Eventually the giraffe will move on from the acacia tree and go to look for a less annoying meal. The acacia plant will also provide nectar that the ants can use to feed their babies. The ants also go up and down the tree and destroy any alien saplings that might be growing on the tree, but it they do not harm the tree in any way while doing this.