Observe the following flow-chart depicting blood-circulation in mammals.

Pick out the correct blood vessels A, B, C, D from the following:

i) Pulmonary veins

ii) Venacava

C. Pulmonary artery

D. Aorta

Among the P,Q,R and S samples, identify the correct match from the following

a) P & Q = Oxygenated and R& S = Deoxygenated

b) P & Q = Deoxygenated and R& S = oxygenated

c) All are Oxygenated

d) All are Deoxygenated

Name the protein and the blood-cells responsible for the clotting of blood.

i) What are the structural and functional units of kidney?

ii) Arrange the organs of the human excretory system in the correct order, based on the passage of urine.

Ureter, Urethra, Kidney, Urinary bladder

Study the following passage:

Most of the vertebrates have jaws with teeth. The mode of arrangement of teeth on the jaws is called dentition.

The various types of teeth seen in mammals are incisors(I) canines (C) premolars (P) and molars (M). They are used for biting, tearing, chewing and grinding respectively.

Canines, the tearing teeth are well-developed in carnivores and ill-developed or absent in herbivores.

Now answer the following questions:

i) In frogs, all the teeth in the upper jaw look alike, whereas in human beings they are different. The type of dentition in man can be called__________.

a) Homodont

b) Isodont

c) Heterodont

d) Acrodont

ii) The dental formula of a mammal is written as ICPM =2023/1023. The teeth missing in it are _________ .

a) incisors

b) b) canines

c) c) premolars

d) d) molars

Fill in the empty boxes with suitable answers with respect to the valves of a mammalian heart.