Advanced Placement (AP) Biology Practice Exam

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Prepare for the AP Biology Exam with a comprehensive study approach. Explore flashcards and multiple choice questions, complete with hints and explanations. Gear up to excel in your exam!

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What percentage of plant fresh mass is primarily water?

50% to 60%
70% to 80%
80% to 90%
90% to 100%

The correct answer is: 80% to 90%

The correct percentage of water in plant fresh mass is primarily centered around the range of 80% to 90%. This high percentage reflects the crucial role that water plays in plant physiology, including processes such as photosynthesis, nutrient transportation, and maintaining cell turgor pressure. Water is vital for plants, as it constitutes a significant portion of their structure and is involved in biochemical reactions essential for growth and metabolic functions. In general, the composition of plant tissues shows that a majority of fresh weight is made up of water, which facilitates various physiological and biochemical processes. The 80% to 90% range captures the typical scenario for many plants, although specific values can differ among species and environmental conditions. This understanding highlights the importance of water in maintaining plant health and productivity.