本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会
[单选题]
Figure: Life cycle of a .to2f u aud8082udbcv Schistosoma iygri8rwew9cqc)1 u mp881(atmw a99species
[Created with Servier Medical Art. CC BY 3.0]
The figure shows the life cycle of a flatworm of the genus Schistosoma. It spends part of its life in a species of ramshorn snail and part of its life in humans. It feeds on these hosts.
State the type of interaction between the human and the flatworm.
A. Mutualism
B. Parasitism
C. Disease
D. Predation
参考答案: B
本题详细解析:
The flatworm is a para,f-f4n: d+yx(x u yy4rqxch bm ;1zeh8site (Option B) of the human as it feeds on the human without providing a benefitfxr1,:zq cd +yb4em4; -(xyf nyhxuh8 to the human.
In mutualism (Option A) both organisms would benefit, e.g. the honeybee (Apis mellifera) and the appletree (Malus domestica), where the bee gets nectar from the tree and the appletree gets pollinated.
While Schistosoma does actually cause the serious disease schistosomiasis, ‘disease' (Option C) does not describe an interaction between species.
In predation (Option D), one organism kills and eats another one, e.g. polar bear (Ursus maritimus) killing and eating ringed seals (Pusa hispida).
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