C4.2.2—Sunlight as principal energy source Topic Practice
C4.2.2—Sunlight as principal energy source Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise explaining sunlight as the starting energy source for ecosystems and how photosynthesis converts light into chemical energy for food chains.
How this is tested
- state sunlight or solar energy as the initial source for food chains when supported
- explain how autotrophs capture light energy and convert it to chemical energy
- link photosynthesis in producers to energy flow through consumers in ecosystems
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