(a) Name all the organ-systems shown completely or even partially.
(b) Name the parts numbered 1 to 5.

(c) Name the structural and functional unit of the part marked ‘1’.
(d) Name the two main organic constituents of the fluid that flows down the part labeled ‘3’.
(e) Name the two major steps involved in the formation of the fluid that passes down the part labeled ‘3’.

Solution –

• The organ system shown are the excretory system and circulatory system .
• The parts are – Number 1 represents Kidney

                                        Number 2 represents Renal artery

                                        Number 3 represents Ureter

                                       Number 4 represents Urinary bladder

                                       Number 5 represents urethra

    (C) Nephron is the structural and functional unit of the part 1 kidney

     (d) Urea and ammonia are the two main organic constituents of the fluid that flows down  the ureter marked as 3.

     (E) ultrafiltration and selective reabsorption