Final answer:
The BMR of a hypophysectomized rat would be higher compared to a normal rat after thyroxine injections.
Step-by-step explanation:
The BMR (Basal Metabolic Rate) of a hypophysectomized rat refers to the rate at which the rat's body consumes energy at rest.
In this case, after thyroxine injections, the BMR of a hypophysectomized rat would be higher compared to a normal rat. Thyroxine is a hormone that regulates the body's metabolic activity, and increasing its levels would result in an elevated BMR.