Q9 of 38 Page 93

Which blood cells are without nuclei? What is the advantage of this condition?

Mature Red blood cells lack nuclei, they have nuclei only in early development. Lack of nuclei makes more room for haemoglobin and thus enable them to carry more oxygen.


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7

Write any four differences between arteries and veins in mammals.

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Name the three important blood proteins seen in plasma. Add a note on their functions.

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

 11

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