Jharkhand PSC Prelim Exam 2008 Solved Paper

(4) The pea is most commonly the small spherical seed or the seed-pod of the pod fruit Pisumsativum. Pea pods are botanically fruit, since they contain seeds and developed from the ovary of a (pea) flower.
Peas, like many legumes, contain symbiotic bacteria called Rhizobia within root nodules of their root systems. These bacteria have the special ability of fixing nitrogen from atmospheric, molecular nitrogen $\left({\mathit{N}}_2\right)$ into ammonia $\left({\mathit{N}\mathit{H}}_3\right)$