Difficult MCQs (O’level biology)

This video lecture includes detailed explanation of some difficult MCQs that appeared in O’level biology paper 1. Correction**** at 15:45 Guys in MCQ no. 5, I called X the renal artery. Because it’s the renal artery but I mistakenly wrote renal vein. X is renal artery and Y is renal vein. Thankyou.