The primary reason plants are unable to grow at the bottom of lakes is that sunlight does not reach the bottom. Aquatic plants generally require sunlight for photosynthesis, and as light penetrates water, it diminishes with depth. Most plants can only grow in the photic zone, which is the upper layer of water where light can penetrate enough to support photosynthesis. Beyond a certain depth, typically a few meters depending on the water's clarity, there is insufficient light for plant growth.
Why are plants unable to grow at the bottom of lakes?
The water is colder at the bottom.
Sunlight does not reach the bottom.
Groundwater feeds into the bottom.
Less fresh water is found at the bottom.
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