Professor Michael Crawley conducted an experiment to determine the effects of herbivory on English Oak. He sprayed some trees with insecticide for 4 years to eliminate insect herbivores. Other trees were left alone as a control. Control plants had an average of 8-12% of their leaves damaged by herbivores. He examined the number of acorns (seeds) produced per shoot (or branch), and obtained the following data. Error bars represent standard errors.
Professor Michael Crawley conducted an experiment to determine the effects of herbivory on English Oak. He sprayed some trees with insecticide for 4 years to eliminate insect herbivores. Other trees were left alone as a control. Control plants had an average of 8-12% of their leaves damaged by herbivores. He examined the number of acorns (seeds) produced per shoot (or branch), and obtained the following data. Error bars represent standard errors.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:Professor Michael Crawley conducted an experiment to determine the effects of
herbivory on English Oak. He sprayed some trees with insecticide for 4 years to
eliminate insect herbivores. Other trees were left alone as a control. Control plants
had an average of 8-12% of their leaves damaged by herbivores. He examined the
number of acorns (seeds) produced per shoot (or branch), and obtained the following
data. Error bars represent standard errors.
1.07
Unsprayed
0.8- Sprayed
0.6-
0.4-
0.2-
Acorns per shoot
Transcribed Image Text:0.2-
0.0-
1981
1982
1983
1984
Year
herbivore feeding had no effect on seed production in English Oak
herbivore feeding reduced seed production in English Oak
herbivore feeding increased seed production in English Oak
spraying insecticide reduced seed production in English Oak
O spraying insecticide had no effect on seed production in English Oak
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