(i) Give a simple definition of the term excretion.
(ii) Against each substance in the list below, write the letter E if you think the substance is excreted; S if you think it is secreted.
Tears .........................
Urea ..........................
Sweat ........................
Renin ...................... [4 MARKS]

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Solution

Each Part: 2 Marks

(i) Excretion is the process by which an organism throws out from its body the metabolic wastes and harmful substances formed in the living cells during metabolism.

(ii)
Tears = S
Urea = E
Sweat = E
Renin = S

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Each Part: 2 Marks (i) Excretion is the process by which an organism throws out from its body the metabolic wastes and harmful substances formed in the living cells during metabolism. (ii) Tears = S Urea = E Sweat = E Renin = S

Each Part: 2 Marks

(i) Excretion is the process by which an organism throws out from its body the metabolic wastes and harmful substances formed in the living cells during metabolism.

(ii)
Tears = S
Urea = E
Sweat = E
Renin = S