Bio 121 Campbell Biology Truman College
Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Chapter 39, Problem 10TYU

SCIENTIFIC INQUIRY A plant biologist observed a peculiar pattern when a tropical shrub was attacked by caterpillars. After a caterpillar ate a leaf, it would skip over nearby leaves and attack a leaf some distance away. Simply removing a leaf did not deter caterpillars from eating nearby leaves. The biologist suspected that an insect-damaged leaf sent out a chemical that signaled nearby leaves. How could the researcher test this hypothesis?

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A biologist finds that a plant is being attacked by beetle larva, which eats flowers. Later that same day, she observes that the air around the plant has an unusual "chemical" odour. Next day, she sees that there are many wasps stinging the caterpillars on the flowers. Give the most likely explanation for this observation and explain the underlyingconcept clearly.
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Some plants in wetter climates release certain chemicals in response to leaf consumption by insects. These chemicals may either repel the leaf-eaters and/or attract other insects that will consume the leaf-eaters. A researcher was interested in whether desert plants emitted the same types of compounds. Desert plants have different kinds of leaves compared to plants from less arid areas. The researcher harvested Coville’s lip fern (Cheilanthes covillei) from deserts in Utah to bring into a greenhouse. The plants were 12 – 15 cm (5 – 6 in) tall. Each plant was placed in a separate pot, and there were 40 pots in all. Each pot was assigned to one of four “leaf eater” treatments: a control (i.e., no insects); 5 hornworms; 5 leaf bugs; or 5 flea beetles. Then the researcher measured the emission rate of a particular repelling compound from each plant once every hour for a total of 8 hours (8:00 am – 4:00 pm). Based on this scenario, please answer the following questions: a) What is the…

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Bio 121 Campbell Biology Truman College

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