Final answer:
The resident flora in the intestine produces vitamin K.
Step-by-step explanation:
The resident flora in the intestine produces vitamin K. Vitamin K is synthesized by bacteria residing in the large intestine. It is a fat-soluble vitamin necessary for proper blood clotting and is involved in the synthesis of prothrombin, a blood plasma protein. The bacteria present in the intestine produce vitamin K if it is not supplied sufficiently in the diet.