Define excretion. Write the four organs of the human urinary system in their correct sequence.

Q. Which of the following organs is not associated with excretion in humans?

Q. Define functional group. Write any four organic functional groups with their formula?

Q. Define vestigial organs. Write names of some vestigial organs in human body and write the names of those animals in whom same organs are functional

Q. Identify the correct sequence of organs / regions in the organization of human ear as an auditory mechanoreceptor organ.

Q. (a) Mention any two components of blood.

(b) Trace the movement of oxygenated blood in the body.

(c) Write the function of valves present in between atria and ventricles.

(d) Write one structural difference between the composition of artery and veins.

OR

(a) Define excretion.

(b) Name the basic filtration unit present in the kidney.

(c) Draw excretory system in human beings and label the following organs of excretory system which perform the following functions :

(i) forms urine.

(ii) is a long tube which collects urine from kidney.

(iii) Store urine until it is passed out.