Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 42.2, Problem 3CC
Summary Introduction

To determine:

The nutrient nitrogen and phosphorus that necessary for Calvin cycle to function photosynthesis, often limit the primary production in an ecosystem.

Introduction:

Primary production provides the origin of energy in an ecosystem, it is the chemical energy generated by fixation of carbon dioxide during photosynthesis and chemosynthesis. Primary production is the source of energy for the entire organism from bacteria to humans. Photosynthesis involve the Calvin cycle that makes sugar from carbon.

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Plants have evolved by developing mechanisms that promote entry of CO, into the Calvin Cycle (CC) to limit photorespiration when environmental conditions tend to favor the latter. This is because photorespiration 1) is energetically inefficient (consuming more ATP than the CC alone) and 2) it does not produce any sugars that can be "fed" into cellular respiration to produce lots more ATP. A) Under what environmental conditions does photorespiration "outcompete" that of the CC? Specifically, what mechanism is responsible for committing the cell to photorespiration and what type of plant does not have any "safeguards" to ensure that the CC is performed rather than photorespiration? B) Describe the mechanisms employed by two types of plants to minimize photorespiration and ensure that the CC is carried out even when environmental conditions are not in their favor. Be sure to identify 1) the type of plant, 2) its natural environment and how it affects the plant's ability to perform the CC,…
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Outline the nature and source of all needed inputs of photosynthesis on land and in water ?
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