Q35 of 367 Page 73

Define excretion. Name the excretory unit of a kidney.

The biological process of removable of harmful metabolic wastes from the body of a living organism is called excretion.

The excretory unit of a kidney is called nephrons.


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33

What are the differences between the transport of materials in xylem and phloem?

 34

Match the terms in column I with their uses in column II



























Column I



Column II



(i) Heart



(a) Pipes for transport in humans



(ii) Arteries and Veins



(b) Clotting of blood



(iii) Xylem vessels



(c) Pumping organ



(iv) RBC



(d) Water transport in plants



(v) Platelets



(e) Carrier of oxygen


 36

What job is done by the kidneys ?

 36

What do kidneys excrete?