問題詳情

請依下文回答第 34 題至第 37 題：Pheromones are substances that serve as chemical signals between members of the same species. They aresecreted to the outside of the body and cause other individuals of the species to have specific reactions. Pheromones,sometimes also called "social hormones," affect a group of individuals somewhat like hormones do to an individualanimal. Pheromones are the predominant medium of communication among insects (but rarely the sole method).Some species have simple pheromone systems and produce only a few pheromones, but others produce many withvarious functions. Pheromone systems are the most complicated in some of the so-called social insects, insects thatlive in organized groups.Pheromones play various roles in the activities of insects. They may act as alarm substances, play a role inindividual and group recognition, serve as attractants between sexes, mediate the formation of aggregations, identifyforaging trails, and be involved in caste determination. For example, pheromones involved in caste determinationinclude the "queen substance" produced by queen honey bees. Aphids, which are particularly vulnerable to predatorsbecause of their gregarious habits and sedentary nature, secrete an alarm pheromone when attacked that causes nearbyaphids to respond by moving away.
34 What do the passages mainly discuss?
(A)how insects use pheromones to facilitate reproduction
(B)how pheromones are produced by insects
(C)why analyzing insect pheromones is thorny
(D)the different uses of pheromones among various insect species

參考答案

答案：D
難度：適中0.583333
統計：A(6),B(12),C(10),D(42),E(0)

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