Energy Flow and Food Chains · NCERT Biology

The measurement of biomass in terms of dry weight is more accurate than fresh weight because:

  1. Dry weight is simpler and faster to measure under field conditions
  2. Fresh weight varies significantly with the organism's water content
  3. Dry weight accounts for the mass of metabolic gases trapped internally
  4. Fresh weight omits the contribution of structural proteins to total mass
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Correct answer: Fresh weight varies significantly with the organism's water content

Water content in organisms can fluctuate rapidly based on environmental conditions and physiological state. Dry weight provides a consistent measure of the actual organic matter.

Difficulty: Medium Question 17 of 20

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