Question

What defines the photic zone in an aquatic ecosystem?

1. The region where light penetrates sufficiently for photosynthesis to occur.
2. The deepest part of the water body where no light reaches.
3. The layer of water where temperature is consistently low.
4. The area where dissolved oxygen levels are at their highest.

• A. 4 only
• B. 2 only
• C. 1 only
• D. 1, 3

Answer 1

Answer:

C. 1 only

• Sunlight is a major limiting factor for water bodies, since light rapidly diminishes as it passes down the column of water.

• The upper layers of the aquatic ecosystems, up to which light penetrates and within which photosynthetic activity is confined forms the photic zone,