本题目来源于试卷: Interaction & Interdependence C.8 Populations & Communities，类别为 IB生物学
[单选题]
Which statement(s) describes allelop w7z -ybr6x/73/mghkda 1rd oaathy in plants7 93r jb vn(hk kqo33w;yc6glo?
I. Allelopathy is the process by which a plant releases secondary metabolites that inhibit the growth of other plants.
II. Allelopathy is the presence of mechanical defences such as thorns and spines in plants.
III. Allelopathy may involve a decreased cell elongation rate in one plant species in response to a chemical secreted by another plant species.
A. $I$ and $III$ only
B. $ II$ only
C. $I$, $II$ and $III$
D. $ I$ only
参考答案: A
本题详细解析:
Explanation: Statements I and III describe the process of allelopathy, which is the release of secondary metabolites by plants to prevent the growth and development of other plants. The decreased rate of cell elongation is one of the physiological effects that can occur as a result of allelopathic interactions. Therefore Choice A is correct. Choice D is incorrect because it only includes one true statement. Statement II is incorrect because, in addition to chemical defences, some plants may have mechanical defences, like thorns which provide physical protection against herbivores. Choices B and C are incorrect as they include this statement.
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