Multiple Choice
Where do plants primarily obtain the energy required to live and grow?
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9. Photosynthesis
Introduction to Photosynthesis
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Which of the following best explains how a cow obtains the carbon it needs for growth?
A
By eating plants that have fixed carbon through photosynthesis
B
By converting sunlight into glucose through chloroplasts
C
By directly absorbing carbon dioxide from the atmosphere
D
By performing photosynthesis in its own cells
Verified step by step guidance1
Understand the concept of carbon fixation: Plants use photosynthesis to convert carbon dioxide (CO₂) from the atmosphere into organic molecules, such as glucose, which contain carbon. This process occurs in chloroplasts within plant cells.
Recognize that cows are heterotrophs: Unlike plants, cows cannot perform photosynthesis because their cells lack chloroplasts. Instead, they rely on consuming organic matter to obtain carbon.
Identify the cow's source of carbon: Cows eat plants, which contain carbon-rich organic molecules produced during photosynthesis. These molecules are broken down during digestion to provide the cow with the carbon it needs for growth and energy.
Eliminate incorrect options: The cow does not convert sunlight into glucose (it lacks chloroplasts), nor does it directly absorb carbon dioxide from the atmosphere (it does not perform photosynthesis). These processes are exclusive to autotrophs like plants.
Conclude the correct explanation: The cow obtains the carbon it needs for growth by consuming plants that have fixed carbon through photosynthesis.
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