Name some useful products or materials that are carried by blood.

2

(a)

Circulatory system consists of three major organs. Name those organs.

2

(a)

Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.

2

(a)

RBC contains a red coloured pigment which carries oxygen with it. What is the pigment called?

2

(a)

Blood is a fluid connective tissue. Justify.

2

(a)

Blood performs various functions including protection against infections. How?

2

(a)

Name the functional units of the major excretory organ of humans.

2

(a)

Exchange of gases, food and other substances occurs between arteries and veins. How does this exchange happen?

2

(a)

Sponges and Hydra do not possess any circulatory system then how do they carry out distribution of food and other substances?

2

(a)

If the heartbeats of a person are more than 72 - 80 beats per minute. What does it signify?

2

(a)

In our heart, there is no mixing of oxygenated and deoxygenated blood. How it is made possible?

2

(a)

What would have been the effect, if no platelets would have been in our blood?

2

(a)

What is the function of valves in veins?

2

(a)

Human excretory system is depicted in the figure.

(a) Label the part 1, 2, 3 and 4
(b) Write the function of 1 & 3.

2

(a)

Boojho's uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.
(a) What is dialysis?
(b) When does it become necessary to take such a treatment?

2

(a)