Consider the following plants: 1. Groundnut 2. Horse-gram 3. Soybean How many of the above belong to the pea family?

All three plants — Groundnut (Arachis hypogaea), Horse-gram (Macrotyloma uniflorum), and Soybean (Glycine max) — belong to the family Fabaceae (also called Leguminosae or the pea/legume family). They are all leguminous plants capable of nitrogen fixation through symbiotic Rhizobium bacteria in their root nodules. Despite groundnut being commonly called a "nut", botanically it is a legume of the pea family. Hence all three belong to the pea family.