Multiple Choice
Which of the following aquatic ecosystems contains the aphotic zone?
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48. Ecology
Introduction to Aquatic Biomes
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Why do phytoplankton (plant plankton) not grow in the deep ocean?
A
The deep ocean is too shallow for phytoplankton to anchor themselves.
B
Phytoplankton are unable to tolerate the high temperatures found in the deep ocean.
C
The deep ocean contains too much oxygen for phytoplankton to survive.
D
There is insufficient sunlight for photosynthesis in deep ocean waters.
Verified step by step guidance1
Phytoplankton are microscopic organisms that perform photosynthesis, a process that requires sunlight to convert carbon dioxide and water into glucose and oxygen.
Photosynthesis primarily occurs in the photic zone of the ocean, which is the upper layer where sunlight can penetrate. This zone typically extends to a depth of about 200 meters, depending on water clarity.
In the deep ocean, sunlight cannot reach because it is blocked by the water column above. Without sunlight, the energy source for photosynthesis is unavailable.
Phytoplankton rely on photosynthesis for their survival and growth, so they cannot thrive in areas where sunlight is insufficient, such as the deep ocean.
The other options provided in the question are incorrect because phytoplankton do not need to anchor themselves, they can tolerate a range of temperatures, and oxygen levels in the deep ocean are not a limiting factor for their survival.
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