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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Efficiency of energy transfers in aquatic ecosystem is typically higher than in land ecosystems because ______.

  1. a. aquatic food webs include more endotherms
  2. b. algae do not make lignin
  3. c. primary production cannot occur in water
  4. d. all of the above

Summary Introduction

Concept introduction: An ecosystem is an arrangement of organisms and their physical environment, all interacting through a one-way flow of energy with respect to the cycling of nutrients. Food chains interconnect as food webs. In a grazing food web, most energy is captured by producer flows to herbivores. In a detrital food web, most energy flows from producers directly to detritivores and decomposers. The efficiency of energy transfers is low; therefore, most food chains have no more than four or five trophic levels.

Explanation

Reason for the correct statement:

Lignin is the most abundant complex plant polymer; it supports and gives rigidity to plant tissue. In an aquatic ecosystem, the number of nitrogen fixation is high; it results in algal bloom and eutrophication. Additional amount of nitrogen and absence of lignin would encourage algal overgrowth.  Therefore, energy is transferred from sunlight through algae to the other trophic levels in the aquatic ecosystem. Therefore, absence of lignin increases the energy transfer in an aquatic ecosystem.

Option b. is given as “algae do not make lignin.

Efficiency of energy transfer in aquatic ecosystem is typically higher than in land ecosystem and is typically higher than land ecosystem because algae do not make lignin. Hence, option b...

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