Ecological Pyramids
Biology ⇒ Ecology and Environment
Ecological Pyramids starts at 8 and continues till grade 12.
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See sample questions for grade 11
Describe how ecological pyramids can be used to assess the impact of human activities on ecosystems.
Describe how the presence of decomposers affects the accuracy of ecological pyramids.
Describe one situation where the pyramid of numbers is inverted.
Describe the main difference between a pyramid of biomass and a pyramid of energy.
Explain why ecological pyramids do not accurately represent food webs.
Explain why food chains rarely have more than four or five trophic levels.
Explain why the pyramid of biomass in an aquatic ecosystem can be inverted.
Explain why the pyramid of energy is always upright.
Explain why the pyramid of energy is considered a better indicator of ecosystem function than the pyramid of numbers or biomass.
If 10,000 J of energy is available at the producer level, how much energy would typically be available to the secondary consumers?
If a food chain has four trophic levels and the energy at the producer level is 20,000 J, calculate the expected energy at the top consumer level.
If a pyramid of energy shows 1000 kcal at the producer level, how much energy would you expect at the tertiary consumer level?
If the biomass of producers in a pond ecosystem is 500 kg and the biomass of primary consumers is 100 kg, what is the biomass of secondary consumers likely to be?
In a grassland ecosystem, which trophic level would have the highest biomass?
In a marine ecosystem, why might the pyramid of biomass be inverted?
In an ecological pyramid, which trophic level is occupied by carnivores that eat herbivores?
