Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 46.4, Problem 1TYK
Summary Introduction

Introduction:

Chemical elements, such as nitrogen and carbon flow in a cycle. They move from the physical environment to the organisms’ body and then back to the environment, from the cycle started. To transport the chemicals in the ecosystem, biogeochemical cycles are involved in the process.

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In the trophic structure, autotrophs are living organisms that:     Are at the top of the chain, referred to as tertiary producers.     Photosynthetic organisms that produce their own energy     Organisms that receive their energy by consuming producers such as plants     Help to decompose the remains of dead organisms
Net primary productivity refers to     the rate of energy storage as organic matter by autotrophs after respiration is deducted     the total rate of photosynthesis, or energy assimilated, by autotrophs     the amount of accumulated organic matter found in an area at a given time     the production of new tissues and offspring by heterotrophs
Which of the following is true of trophic relationships in an ecosystem? All energy in the food chain is ultimately transferred to top level carnivores Most of the useable energy transferred between trophic levels is maintained--very little is lost The trophic pyramid predicts that top level carnivores should have the least amount of biomass in an ecosystem Net productivity is typically a measure of over-all photosynthesis in an ecosystem
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