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Explain why insects excrete uric acid as their principal nitrogenous waste. - HSC - SSCE Biology - Question 22 - 2015 - Paper 1
Question 22
Explain why insects excrete uric acid as their principal nitrogenous waste.
Worked Solution & Example Answer:Explain why insects excrete uric acid as their principal nitrogenous waste. - HSC - SSCE Biology - Question 22 - 2015 - Paper 1
Step 1
Relates a property of uric acid to its suitability as nitrogenous waste in insects.
Answer
Insects excrete uric acid primarily because it is less toxic and requires less water for excretion compared to other nitrogenous wastes like ammonia. This is particularly advantageous in their terrestrial habitats, where water conservation is crucial for survival.
Step 2
Provides some information appropriate to the elimination of nitrogenous waste in insects.
Answer
The excretion of uric acid allows insects to eliminate waste while minimizing water loss. Uric acid is insoluble in water and is excreted in a paste-like form, which further aids in conserving moisture in their environment.