Question
In the animal kingdom some examples of structures (internal or external) with similar name and function are found in distantly related animals. This is a fascinating example of convergent evolution. Choose the correct option exhibiting such similarity by possessing an organ called 'CROP' :
Options
Solution
Sol. Key concept: A crop is an expanded foregut region used chiefly for food storage.
In leeches, the crop has diverticula that store a large meal, particularly blood in blood-feeding species. In the cockroach, the crop is an enlarged part of the foregut that temporarily stores food before it passes to the gizzard.
Many birds have an enlargement of the oesophagus called the crop, where food can be stored and softened before further digestion. These examples share a similar storage function despite their different evolutionary histories.
Thus leech, cockroach and bird form the intended set, option c. The presence of a crop in earthworm alone does not make option b correct; every listed animal in a proposed group must satisfy the criterion.
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