What is the principal source of energy entering biological systems?
The Sun.
Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) · 19.1
Revise Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) specification point 19.1, Energy flow, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What is the principal source of energy entering biological systems?
The Sun.
What energy conversion do producers carry out using sunlight?
They convert light energy into chemical energy stored in organic substances.
How does chemical energy pass between organisms?
Through feeding.
What ultimately happens to energy as organisms use it?
It is transferred to the environment, chiefly as heat.