Question

Why is the overturn process important for lakes that undergo stratification?

1. It prevents the formation of ice cover.
2. It ensures thorough mixing of oxygen, phytoplankton, and nutrients.
3. It leads to the accumulation of sediments at the bottom.
4. It only affects the temperature of the surface water.

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

Answer 1

Answer:

D. 2 only

OVERTURN

• Circulation of lake water occurs twice a year, in the spring and autumn (fall) seasons by a process called overturn.

• This circulation is important for lakes which undergo stratification as it allows thorough mixing of oxygen, phytoplankton and nutrients within the lake.