Campbell Essential Biology with Physiology (6th Edition)
Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 20, Problem 14PS
Summary Introduction

To explain: The type of interaction that takes place between all the five wildflower species that are enclosed with fences to keep out kangaroo rats, most common herbivores in the area.

Concept introduction: The intra-specific interaction is a type of interaction between species. Dominating species survive and progressively increase in this type of interaction. When the members of same or different species start living in a particular habitat; they show some effects on each other, due to limited resources. These effects produced by organisms on each other are known as biological interactions. These interactions may be short-term like predation or long-term like mutualism.

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An ecologist studying plants in the desert performed the following experiment. She staked out two identical plots, which included a few sagebrush plants and numerous small, annual wildflowers. She found the same five wildflower species in roughly equal numbers on both plots. She then enclosed one of the plots with a fence to keep out kangaroo rats, the most common grain-eaters of the area. After two years, to her surprise, four of the wildflower species were no longer present in the fenced plot, but one species had increased dramatically. The control plot had not changed. Using the principles of ecology, propose a hypothesis to explain her results. What additional evidence would support your hypothesis?
In another experiment, fishes were placed in separate aquarium tanks with water coming from three different waterways in Los Baños.  Three tanks were filled with water from each source and equal number of fish were placed in each tank. The tanks were refilled as required with water from the original sources. Two plant species known to be bioremediators were tested and compared with a control (no plants).  Three tanks were assigned to each of the plant species and the control.  After three months, a sample of fish was taken from each tank and evaluated whether the fish contains heavy metals above the threshhold(1) and 0, otherwise.  Which is the most appropriate procedure to compare the plant species and the control?  A. F-test B. t-test C. Cochran’s Q D. Friedman test
Which of these hypotheses does not explain why increased CO2 levels in the atmosphere could cause a decrease in the productivity of some crops because of changes in climate?   A) There could be increases in average winter temperatures that reduce the growth of crops. B) There could be decreases in precipitation in some regions that reduce growth in some crops. C) There could be shifts in the ranges of some important species in the community, such as pollinators, that cause reduction of growth in some crops.
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