Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

Organisms at the lowest trophic level in a tallgrass prairie are all _______.

  1. a. two steps away from the original energy input
  2. b. autotrophs
  3. c. heterotrophs
  4. d. both a and b
  5. e. both a and c

Summary Introduction

Introduction: An ecosystem is an arrangement of organisms and their physical environment in which all the components interact through a one-way flow of energy with respect to cycling of nutrients. It is an open flow system that requires ongoing inputs of energy and nutrients.


Reason for the correct statement:

The ecosystem of the Earth is remarkably diverse in their characteristics. Plants and phytoplankton are the main producers in an ecosystem. The autotrophic organisms are mainly the primary producers and they can make their own food. In tallgrass prairie, the lowest trophic level is the plants that are autotrophs. Autotrophs or the self-feeders obtain energy from a nonliving source, especially sunlight and use it to build organic compounds from the inorganic materials.

Option b. is given as “autotrophs”.

In a tallgrass prairie, the organisms at the lowest trophic level are all autotrophs. Hence, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “two steps away from the original energy input”.

The original energy input in an ecosystem is at the lowest trophic level, generally plants. They are the autotrophs as they make their own food. Therefore, option a...

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