Campbell Biology (11th Edition)
Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 54, Problem 7TYU
Summary Introduction

Introduction: Top down control refers to the situation where the removal of a top predator leads to disruption of the food chain. The top predator regulates the population of herbivores, which in turn regulate the population of plants. The plants regulate the nutrient level through absorption from the soil. Thus, the removal of top predator can result in drastic changes in the ecosystem.

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Which of the following could qualify as a top-down control ona grassland community?(A) limitation of plant biomass by rainfall amount(B) influence of temperature on competition among plants(C) influence of soil nutrients on the abundance of grassesversus wildflowers(D) effect of grazing intensity by bison on plant speciesdiversity
The Jena experiment tested the effects of plant species richness on the ecosystem function of various grassland areas over a 15-year timespan. Ecosystem function was determined by measuring the biomass, soil characteristics, types, and numbers of producers and consumers in the area, and tested to determine the strength of the biodiversity effect on the ecosystem. The graphs show the ecosystem function at the onset of the experiment (dotted line) versus the ecosystem function at the end of the 15-year experiment (solid line) in four different test sites (A, B, C, and D).
As the fertility of soil on the forest floor increases, which of the following most likely will occur? Mark only one oval. 00 A) size of plants decreases. B) growth rate of plants increases. C) density of plants decreases. D) number of species of plants increases. E) probably nothing not benefited. Mark only one oval. levolls aviat estela Related to the greater Yellowstone area and according to abundance levels, have benefited from wolf reintroduction, while have ainerion A) grizzly bears, brown bears B) beavers, aspen trees C) woody plant species, beavers D) all of the above first listed species, elk A) zonation. OB) stratification. C) succession. D) characterization. OE) vector-born bond woll 19v altide A (0) lagens ewolis témns) A (0) anomoe ni sunt aniq bio nA (SSSS oorhoorigion Mos Jealsong visuau al vinum Changes in community composition and structure over time are called which of the following? Jovo sto no he Mark only one oval. 2000 abnedm 1003 en avoubisen (0 esw 162 (3 CD…

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Campbell Biology (11th Edition)

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