CIE iGCSE Co-Ordinated Science B18.1 Energy flow Exam Style Questions Paper 1
▶️ Answer/Explanation
This energy is obtained by feeding on other organisms, since energy is passed along the food chain from producers to consumers.
Water, oxygen and disease protection are not the universal reason all organisms in a food chain feed; energy is.
✅ Answer: (D)
Question
Where does the principal source of energy for an ecosystem come from?
A. decay
B. the soil
C. the Sun
D. water
▶️Answer/Explanation
Answer: C. the Sun
Explanation: The Sun is the primary source of energy for almost all ecosystems on Earth. Plants, algae, and some bacteria capture solar energy through photosynthesis, which is then transferred through the food chain.
Question
What is the principal source of energy input into a biological system?
A consumer
B decomposer
C producer
D Sun
▶️Answer/Explanation
Answer: D
Explanation: The Sun is the primary source of energy for most biological systems, driving photosynthesis in producers.
Question
How do herbivores get their energy?
A. by eating animals and plants
B. by eating animals only
C. by eating plants only
D. directly from sunlight
▶️Answer/Explanation
Answer: C
Explanation: Herbivores are organisms that obtain their energy by consuming plants. They are primary consumers in the food chain.