How to termites use fungi?

The termites cultivate the fungi in a fungus garden, comprising a few hundred fungus combs, structures built from chewed up grass and wood, and inoculated with fungal spores. Each year, these fungi produce a crop of large mushrooms (pictured at left), known locally as omajowa, which are highly prized as a delicacy.

Explanation:

c. 4.54 x 10–12 j happens to be correct