The device is a burner from an electric stove. it is used to transfer heat to a pot by a. conduction b. convection c. radiation d. friction

A device is a burner from an electric stove. Then the conduction heat is transferred to a pot.

Conduction heat is a method of heat transfer in which the the transfer is takes place by direct contact between objects. From the question , it is clear that, the burner from electric stove transfers energy to a bottom of the pot sitting on it.

because growing process had stoped after 4-5 year