Multiple Choice
What is the importance of turnover in temperate lakes?
48. Ecology
Introduction to Ecology
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Below the photic zone of the ocean, __________.
A
phytoplankton outnumber zooplankton
B
plants are rooted in the sandy bottom
C
primary producers capture the sun's energy, which is then passed up the energy pyramid
D
all the organisms are either floating or free-swimming
E
food chains are detritus-based
Verified step by step guidance1
Understand the concept of the photic zone: The photic zone is the upper layer of a body of water that receives enough sunlight for photosynthesis to occur. Below this zone, sunlight is insufficient for photosynthesis.
Identify the characteristics of the aphotic zone: Below the photic zone, known as the aphotic zone, there is little to no light, making photosynthesis impossible. Therefore, primary producers like phytoplankton cannot capture the sun's energy here.
Consider the types of organisms present: In the aphotic zone, organisms are not reliant on sunlight for energy. Instead, they depend on organic matter that sinks from the photic zone or other sources of nutrients.
Understand detritus-based food chains: In the absence of sunlight, food chains in the aphotic zone are often based on detritus, which is dead organic material. Organisms in this zone feed on detritus, and energy is transferred through the ecosystem in this manner.
Conclude with the correct answer: Given the conditions below the photic zone, the correct statement is that food chains are detritus-based, as primary producers cannot capture sunlight and support the energy pyramid.
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