BI-1890
Pyramids of numbers and biomass
Biology · Secondary 4 · Hard · Pyramids of numbers and biomass
Why is a pyramid of biomass for a food chain almost always upright (wide at the bottom and narrow at the top)?
- At each trophic level, total biomass decreases because energy is lost through respiration and waste.
- Decomposers always have the greatest biomass, making the top widest.
- Producers always have less biomass than top consumers in any ecosystem.
- Biomass is created at each trophic level without using energy from the level below.
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