Massachusetts Comprehensive Assessment System (MCAS) Biology Practice Test

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Prepare for the Massachusetts Comprehensive Assessment System (MCAS) Biology Test. Ace your exam with flashcards and multiple-choice questions, all with helpful hints and explanations. Start studying today!

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How do trees contribute to the oxygen cycle?

Trees absorb oxygen during photosynthesis
Trees make oxygen and release it into the atmosphere
Trees do not affect the oxygen cycle
Trees only consume oxygen through respiration

The correct answer is: Trees make oxygen and release it into the atmosphere

Trees contribute to the oxygen cycle through the process of photosynthesis, during which they take in carbon dioxide and water, using sunlight to convert these into glucose and oxygen. The oxygen produced is released into the atmosphere, making trees crucial players in maintaining atmospheric oxygen levels. This process not only replenishes the oxygen we breathe but also supports life on Earth by providing an essential resource for animals and humans. While trees do consume oxygen through respiration, this process does not outweigh their contribution to the oxygen cycle through photosynthesis. Therefore, their role in producing and releasing oxygen is vital to the balance of gases in our atmosphere.