Question

6. Study specimens H, K, L and M and answer questions 6(a) to 6(f).
(a) State two observable structural differences between: (i) specimens H and L; (ii) specimens K and M.
(b) State two ways each by which specimens H and M adapt to their modes of life.
(c) Make a drawing, 8cm to 10cm long of specimen M and label fully.
(d) Name one habitat of the organism that possesses specimen K.
(e) Name one feeding habit of each of the organisms that possess specimens H and L.
(f) State two observable similarities between specimens H and L.

Accepted Answer

(a)(i) Observable structural differences between specimens H and L (based on ear/appendage type descriptions): 'I' refers to the ear ossicles — these bones are reputed as the smallest bones in the body. They are three in number: Malleus (Hammer); Incus (Anvil); Stapes (Stirrup).
(ii) Observable structural differences between specimens K and M (webbed feet vs claws): K has no webbed feet with long and curved claws; M has webbed feet with short and flattened claws.

(b) Adaptations: H has a sharp pointed beak for picking food, and has eyes for sight; M has webbed feet for swimming.

(c) [Drawing of specimen M, 8-10cm long, fully labelled with beak, webbed feet, and relevant body parts.]

(d) The organism possessing specimen K has a terrestrial habitat.

(e) Feeding habits: H is heterotrophic (or holozoic); L exhibits filter feeding.

(f) Similarities between H and L: They both have beaks; They both possess eyes.

WAEC Biology 2022 Theory — Question 6

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