Multiple Choice
Which statement best describes how organisms demonstrate the transformation of energy?
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7. Energy and Metabolism
Introduction to Energy
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Which two primary sources of energy power living systems?
A
Sunlight and chemical compounds
B
Sound waves and radioactivity
C
Wind and geothermal heat
D
Magnetism and gravity
Verified step by step guidance1
Understand the question: The problem is asking about the primary sources of energy that power living systems, which are essential for biological processes such as growth, reproduction, and metabolism.
Recall the two main ways organisms obtain energy: (1) Photosynthesis, where organisms like plants and algae use sunlight to produce energy, and (2) Chemosynthesis, where certain organisms use chemical compounds to produce energy in environments without sunlight.
Eliminate incorrect options: Sound waves, radioactivity, wind, geothermal heat, magnetism, and gravity are not primary energy sources for biological systems. These may influence the environment but do not directly power living systems.
Focus on the correct sources: Sunlight is the primary energy source for photosynthetic organisms, while chemical compounds are used by chemosynthetic organisms in environments like deep-sea hydrothermal vents.
Conclude that the correct answer is 'Sunlight and chemical compounds,' as these are the two primary sources of energy that sustain life on Earth.
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