While learning to ride a bicycle Rajan lost his balance and fell. He got bruises on his knees
and it started bleeding. However, the bleeding stopped after sometime.
a) Why did the bleeding stop?
b) What would be the colour of the wounded area and why?
c) Which type of blood cells are responsible for clotting of blood?
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Answer: 1 The bleeding stopped because blood clot had formed.
2 The colour of the wounded area would be dark red due to clotting of blood. Platelets are responsible for clotting of blood.
3 The main job of platelets, or thrombocytes, is blood clotting. Platelets are much smaller in size than the other blood cells. They group together to form clumps, or a plug, in the hole of a vessel to stop bleeding.
Explanation:
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