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IB Biology SL C4.2.2 Sunlight As Principal Energy Source Questions

Sunlight is the principal energy source for most ecosystems. Producers convert light into chemical energy through photosynthesis, which then moves through food chains. Some low-light ecosystems, including deep-ocean vents and some caves, depend on chemosynthetic organisms instead. In IB Biology SL C4.2.2, exam questions ask you to name sunlight as a food-chain energy source and explain how photosynthesis makes that energy available.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • State that sunlight is the initial energy source for most ecosystem food chains.
  • Explain how autotrophs capture sunlight by photosynthesis, convert it to chemical energy and transfer energy through trophic levels with losses as heat.

IB Biology SL C4.2.2 Sunlight As Principal Energy Source Questions question 1

[Maximum number: 7]

Compounds of carbon, hydrogen and oxygen are used to supply and store energy.

Explain how the energy supply in an ecosystem is dependent on sunlight.

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