1. (i) The arrangement of xylem tissue in a vascular bundle such that the protoxylem is at the centre and the metaxylem is towards the periphery.   2. (ii) The region of distinct vision in the eye.   3. (iii) The surgical method of sterilization in the human female.   4. (iv) The carbohydrate molecule found in the cell wall.   5. (v) The process by which cells engulf pathogens.