   Chapter 54, Problem 2TYK ### Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

#### Solutions

Chapter
Section ### Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

# The total dry weight of plant material in a forest is a measure of the forest’s:a. gross primary productivity.b. net primary productivity.c. cellular respiration.d. standing crop biomass.e. ecological efficiency.

Summary Introduction

Introduction:

The Sun is the source of energy for all ecosystems. Most of the energy that reaches Earth’s surface is either absorbed by the water bodies or reflected back into the atmosphere by the clouds or solid surfaces. Approximately 1% (percent) of this energy is used by plants for photosynthesis. Plants are the primary producers that use energy to produce several kilograms of dry plant material per square meter per year.

Explanation

Option (d) is given as standing crop biomass. This is correct as the dry weight of a plant material per unit area or the volume in a habitat is its biomass. Standing crop biomass is the total dry weight of plant material in a habitat at a given time. Hence, option (d) is correct.

Option (a) is given as gross primary productivity (GPP). This is incorrect because gross primary productivity is defined as the rate at which the transformation of the solar energy into chemical energy occurs in the plants. It is the total quantity of food present in the plant prior to respiratory losses. So, it is an incorrect option.

Option (b) is given as net primary productivity (NPP). This is incorrect because net primary productivity is the chemical energy left after deducting the energy used by plants for respiration from the gross primary productivity...

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