K327 / K328 / 2027

Organisms and their environment

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A caterpillar eats a leaf, and a bird eats the caterpillar. Which statement is correct?

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A lower level contains 8,000 kJ and the next level contains 600 kJ of new biomass energy over the same period. What is the transfer efficiency?

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Why can a single tree have a narrow bar in a numbers pyramid but a broad bar in a biomass pyramid?

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Which process transfers carbon from atmospheric carbon dioxide into a plant's organic molecules?

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Which explanation of deforestation and warming is most complete?

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Explain a feeding and energy pathway

In an original chain, grass feeds grasshoppers, which feed frogs. New biomass energy over the same area and year is 15,000 kJ in grass and 1,800 kJ in grasshoppers. Identify feeding roles, calculate the transfer efficiency and explain why energy does not cycle back through decomposers.

Connect arrows, trophic roles, calculation and the eventual fate of energy.

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