Multiple Choice
Where do people and other animals primarily obtain the energy needed for movement?
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7. Energy and Metabolism
Introduction to Energy
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which two primary sources of energy power living systems?
A
Gravity and magnetic fields
B
Sound waves and tidal forces
C
Sunlight and chemical compounds
D
Wind and geothermal heat
Verified step by step guidance1
Step 1: Begin by understanding the concept of energy sources for living systems. Living organisms require energy to perform essential functions such as growth, reproduction, and maintaining homeostasis.
Step 2: Recognize that the two primary sources of energy for living systems are sunlight and chemical compounds. Sunlight is harnessed by autotrophs (like plants and algae) through photosynthesis, converting light energy into chemical energy stored in glucose.
Step 3: Chemical compounds serve as an energy source for organisms that cannot perform photosynthesis. These organisms, known as heterotrophs, obtain energy by breaking down organic molecules (e.g., carbohydrates, fats, and proteins) through cellular respiration.
Step 4: Understand that sunlight and chemical compounds are fundamental because they provide the energy needed to sustain ecosystems. Sunlight drives the energy flow in ecosystems, while chemical compounds allow energy transfer between organisms.
Step 5: Eliminate incorrect options by considering their relevance to biological systems. Gravity, magnetic fields, sound waves, tidal forces, wind, and geothermal heat are not primary energy sources for living systems, as they do not directly provide energy for biological processes.
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