In a lake, the depth down to which photosynthesis can still happen, roughly 200 metres, is the:
APhonic zone
BPlastic zone
CPolar zone
DPhotic zone
Answer & Solution
Correct answer: D. Photic zone
1. Light fades with depth until it is too dim to drive photosynthesis.
2. Above that limit producers can live; below it they cannot.
3. That upper layer is the photic zone.
_Source: OpenStax Concepts of Biology, Chapter 20, Ecosystems and the Biosphere._
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