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Difficulty: MediumEvolutionary Trends and Adaptive Features in Organisms

As animals evolved from simple body plans to higher complexity, specialized structures arose to handle metabolic waste elimination and osmoregulation efficiently in different habitats. Which of the following correctly matches an animal group with its evolutionary excretory adaptation?

  1. Insects utilizing Malpighian tubules to conserve water by excreting nitrogenous waste as uric acidAnswer
  2. B
    Annelids employing flame cells to filter coelomic fluid and excrete fluid waste through skin pores
  3. C
    Flatworms using nephridia to perform selective reabsorption from blood vessels
  4. D
    Crustaceans utilizing green glands situated along abdominal segments for waste excretion

Answer

Insects utilizing Malpighian tubules to conserve water by excreting nitrogenous waste as uric acid.
Insects evolved Malpighian tubules as a key structural adaptation for life on land. These tubules extract nitrogenous wastes and solutes from hemolymph, converting waste into solid uric acid while reabsorbing water in the hindgut, which prevents dehydration.

Step-by-Step Solution

1
Analyze the evolutionary progression of excretory systems across animal phyla.
Simple invertebrates (Platyhelminthes) possess flame cells, annelids possess nephridia, and terrestrial arthropods (insects) possess Malpighian tubules.
Tracking evolutionary trends requires matching specific excretory structures to their respective taxonomic groups.
2
Evaluate the functional and anatomical accuracy of each option.
Malpighian tubules in insects are linked to the alimentary canal to excrete dry uric acid, minimizing water loss in land environments. Options misassigning flame cells to annelids, nephridia to flatworms, or abdominal locations to crustacean green glands are anatomically incorrect.
Correct identification relies on accurate structure-function-taxa mapping.

Key Concept

Evolutionary Trends in Animal Excretory Systems
Estimated Time:1m 0s
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Topics

Evolutionary Trends and Adaptive Features in Organisms

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