Exemption from jury service is not a ground of challenge, but the privilege of the person exempt.
“You and each of you do solemnly swear (or affirm) that you will well and truly try the issues wherein _______________________________________________________ is plaintiff and ___________________________________________________is defendant, and a true verdict render; and that you will do so solely on the evidence introduced and in accordance with the instructions of the court.”
Iowa. R. Civ. P. 1.915