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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What is the role of trees in the water cycle?

Trees filter water from the soil
Trees absorb water but do not release it
Trees facilitate transpiration, releasing water into the atmosphere
Trees primarily store water in their trunks

The correct answer is: Trees facilitate transpiration, releasing water into the atmosphere

Trees play a critical role in the water cycle primarily through the process of transpiration. During transpiration, trees absorb water from the soil through their roots. This water then travels up through the plant and is released into the atmosphere as water vapor through tiny openings in the leaves called stomata. This release of water vapor contributes to humidity in the air and can lead to cloud formation, ultimately influencing weather patterns and precipitation. This process is essential for maintaining the water cycle because it helps to regulate moisture levels in the atmosphere and return water to the environment. While trees do filter water and can store some water in their structure, their primary function in the water cycle is to facilitate the transfer of water from the soil to the atmosphere.