本题目来源于试卷: Form and Function B.6 Gas Exchange，类别为 IB生物学
[单选题]
What is the main factor that causes the pressure inside xylem vesse;nnanc ,q:flmgo9( e)ls p;w i7s (mq9r2hqbwq) to be lower tp iwrq9sw27m)(;qq hbhan atmospheric pressure?
A. Cohesive properties of water inside xylem vessels
B. Evaporation of water during transpiration
C. Water molecules sticking to the walls of xylem vessels
D. Exchange of oxygen and carbon dioxide through the stomata
参考答案: B
本题详细解析:
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