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ICSE Class 10 Biology Question 9 of 12

Solved 2018 Question Paper ICSE Class 10 Biology — Question 9

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Question 6(a)

Given below is a diagram of a human blood smear. Study the diagram and answer the questions that follow: [5]

The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow. Name the structure represented in the diagram. What is the liquid entering part 1 called? Name two substances present in this liquid that are reabsorbed in the tubule. What is the fluid that comes to part 2 called? Name the main nitrogenous waste in it. Mention the three main steps involved in the formation of the fluid mentioned in (iii) above. Name the substance which may be present in the fluid in part 2 if a person suffers from Diabetes mellitus. ICSE 2018 Biology Solved Question Paper.

(i) Name the components numbered '1' to '4'.

(ii) Mention two structural differences between the parts '1' and '2'.

(iii) Name the soluble protein found in part '4' which forms insoluble threads during clotting of blood.

(iv) What is the average lifespan of the component numbered '1'?

(v) Component numbered '1' do not have certain organelles but are very efficient in their function. Explain.

Answer

(i) Components numbered '1' to '4' are:

  • 1 → RBC / Erythrocytes
  • 2 → WBC / Leucocytes
  • 3 → Platelets / Thrombocytes
  • 4 → Plasma

(ii) Two structural differences between the parts '1' (RBC) and '2' (WBC) are:

RBCWBC
Biconcave disc likeIrregular, Amoeboid
Nucleus absentNucleus present

(iii) The soluble protein found in part '4' is Fibrinogen.

(iv) The average lifespan of the component numbered '1' (i.e., RBC) is 120 days.

(v) The component numbered 1 i.e., Red Blood Corpuscles (RBCs) do not have mitochondria or ribosomes and nucleus; they are denucleated. The main function of RBCs is the transport of oxygen to the cells of the body, hence they do not have mitochondria making them more efficient. They lack a nucleus which enables them to squeeze through and move easily through narrow vessels like capillaries.