While learning to ride a bicycle Boojho lost his balance and fell

cbse
cbse-class-7-science
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#1

While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after some time.

  • Why did the bleeding stop?
  • What would be the colour of the wounded area and why?
  • Which type of blood cells are responsible for clotting of blood?

Answer:

  • The bleeding stopped because blood clot had formed.
  • The colour of the wounded area would be dark red due to clotting of blood.
  • Platelets are responsible for clotting of blood.