OBJECTIVE LIFE SCIENCE
DIVERSITY AMONG LIFE FORMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a goat’s leg and a bird’s feathers
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a mouse’s nose and a pig’s teeth
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a fish tail and a rabbit’s leg
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a bird’s wing and a human’s arm
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Detailed explanation-1: -Although both the wing and arm are morphologically different and perform different functions but anatomically they resemble each other. They show similarities in the pattern of bones of forelimbs . They have the same set of bones i.e. humerus, radius, ulna, and phalanges.
Detailed explanation-2: -The wing of a bird and the arm of a human are examples of d) analogousstructures. The bones within a birds wing and a human arm are similar, but not likely derived from the same ancestor. The bones developed to give both animals reach, but the bones are different enough to assume that they are from different ancestors.
Detailed explanation-3: -Bird and bat wings are analogous-that is, they have separate evolutionary origins, but are superficially similar because they have both experienced natural selection that shaped them to play a key role in flight. Analogies are the result of convergent evolution.