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]
Which of the following substances typically moves either in or ou k5 *iw;einn0:etlp41nj)jn g t of a leaf'iyd-yj +hx ju0ta5 *u1s in* 0jatx5 ui+hu- dyyj1ner air space via stomata?
I. Water
II. Oxygen
III. Mineral ions
A. I only
B. III only
C. I and II
D. I, II and III
参考答案: C
本题详细解析:
Water diffuses out of stomata from the inner air space of leaves during transpiration (Option I). Because oxygen is produced during photosynthesis, its concentration is generally higher in the inner air space than the atmosphere which means it diffuses out through the stomata (Option II). Mineral ions (Option III) enter plants through root cells, not through the stomata.
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