Multiple Choice
Which of the following is the correct chemical equation for photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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What is the original source of the energy stored in fossil fuels?
A
The Moon
B
The Sun
C
Earth's geothermal heat
D
Radioactive decay of elements
Verified step by step guidance1
Understand the nature of fossil fuels: Fossil fuels, such as coal, oil, and natural gas, are formed from the remains of ancient plants and animals that lived millions of years ago. These organisms relied on energy to grow and survive.
Identify the energy source for ancient organisms: Plants, as primary producers, use photosynthesis to convert sunlight into chemical energy stored in their tissues. This process is driven by solar energy.
Explain the energy transfer: When animals consume plants or other animals, the chemical energy stored in the plants is transferred through the food chain. This energy ultimately originates from the Sun.
Relate this to fossil fuel formation: Over millions of years, the remains of these organisms were subjected to heat and pressure under Earth's surface, transforming their stored chemical energy into fossil fuels.
Conclude the original energy source: Since the energy stored in fossil fuels comes from the chemical energy in ancient organisms, and that chemical energy was derived from sunlight via photosynthesis, the original source of energy in fossil fuels is the Sun.
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