Question

4. An individual ate a hot and large meal of cassava with salty groundnut soup. The individual was sweating profusely and did not drink water after the meal. (a) State one role each played by the following organs involved in the activity above: (i) mouth; (ii) skin; (iii) tongue; (iv) kidney; (v) stomach; (vi) small intestine; (vii) large intestine; (viii) liver.

Accepted Answer

(i) Mouth — contains salivary glands/secretes saliva which contains ptyalin/salivary amylase; moistens/softens the food.
(ii) Skin — excretes sweat/controls body temperature; excretes excess salt/eliminates excretory wastes.
(iii) Tongue — tastes the food; rolls the food into a bolus.
(iv) Kidney — excretes excess salt/excess water; carries out osmoregulation.
(v) Stomach — temporary storage of food; churning of food and turning it into chyme.
(vi) Small intestine — maltase converts maltose to glucose; lipase converts fats and oil to glycerol and fatty acids.
(vii) Large intestine — absorbs water from undigested food; moves waste to the rectum as faeces for expulsion through the anus.
(viii) Liver — deaminates excess amino acid; converts excess glucose to glycogen for storage.

WAEC Biology 2024 Theory — Question 4

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