CAIE IGCSE Biology 19.1.1 The Sun as the Principal Energy Source
Practise identifying the Sun as the principal energy input to biological systems, food chains and food webs.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state the Sun or sunlight as the principal source of energy input to biological systems
- identify the Sun as the original energy source when a food chain begins with a producer
19.1.1—Sun is the principal source of energy question 1
The dominant grass species in an African grassland ecosystem are star grass and red oat grass.
- Star grass is eaten by antelope species, such as topi and Thomson's gazelle.
- Smaller animals such as mice and grasshoppers feed on red oat grass.
- Topi and Thomson's gazelle are eaten by predators such as cheetahs, lions and serval cats.
- Grasshoppers and mice are eaten by serval cats and tawny eagles.
- Vultures feed on dead mammals.
Fig. 1.1 shows part of the food web for this ecosystem.
Fig. 1.1
State the principal source of energy for the food web shown in Fig. 1.1.
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