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Difficulty: EasyEnergy Flow, Food Chains, and Ecological Pyramids

Match each organism or ecological role on the left with its corresponding trophic level or function in energy flow on the right.

  • Green plants and phytoplanktonPrimary producers (Trophic Level 1)
  • Herbivores such as grasshoppersPrimary consumers (Trophic Level 2)
  • Carnivores such as frogsSecondary consumers (Trophic Level 3)
  • Saprophytic fungi and bacteriaDecomposers recycling organic matter

Answer

Green plants and phytoplankton match with Primary producers (Trophic Level 1); Herbivores such as grasshoppers match with Primary consumers (Trophic Level 2); Carnivores such as frogs match with Secondary consumers (Trophic Level 3); Saprophytic fungi and bacteria match with Decomposers recycling organic matter.
Organisms are categorized into trophic levels based on their source of energy: photosynthetic autotrophs are primary producers (Level 1), plant-eaters are primary consumers (Level 2), animal-eaters preying on herbivores are secondary consumers (Level 3), and decay organisms recycle organic matter as decomposers.

Step-by-Step Solution

1
Identify the energy-capturing organisms in an ecosystem.
Green plants and phytoplankton capture solar energy to synthesize food, placing them at Trophic Level 1 as primary producers.
Primary producers form the foundational trophic level in all food chains.
2
Identify organisms that directly feed on producers.
Herbivores such as grasshoppers consume plant matter directly, placing them at Trophic Level 2 as primary consumers.
Direct consumers of autotrophs occupy the second trophic position.
3
Identify organisms that prey on primary consumers.
Carnivores such as frogs feed on primary consumers (herbivores), placing them at Trophic Level 3 as secondary consumers.
Predators of herbivores occupy the third trophic position in energy transfer.
4
Identify organisms responsible for breaking down dead organic waste.
Saprophytic fungi and bacteria digest non-living organic matter, functioning as decomposers.
Decomposers facilitate nutrient recycling back into abiotic ecosystem pools.

Key Concept

Trophic level classification and functional roles in food chains
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Topics

Energy Flow, Food Chains, and Ecological Pyramids

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