IB Biology SL C4.2 Transfers of energy and matter questions

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Question 1

Multiple choiceEasy1 mark

The diagram shows the inputs used by four organisms that synthesize carbon compounds. Which organism is an autotroph?

The carbon source shown is the sole carbon-containing input.external light energyglucoseOrganism Acarbon compoundsexternal light energyamino acidsOrganism Bcarbon compoundsexternal light energycarbon dioxide (CO2)Organism Ccarbon compoundsexternal light energystarchOrganism Dcarbon compounds
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Answer: C. An autotroph uses an external energy source to synthesize carbon compounds from simple inorganic substances. Organism C receives external light energy and its sole carbon-containing input is CO₂, a simple inorganic substance.

A: treats glucose, an organic carbon source, as a simple inorganic substance.
B: treats amino acids, which are organic, as a simple inorganic carbon source.
D: treats starch, an organic carbon source, as a simple inorganic substance.
Remember: autotrophy depends on the source of carbon, not only on the energy source.

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