Question

Consider the characteristics of the Hypolimnion layer in a stratified lake. Which statement is accurate?

1. The Hypolimnion is the upper, circulating layer rich in oxygen and nutrients.
2. The Hypolimnion is the bottom layer characterized by cold temperatures and low oxygen levels.
3. Decomposition processes in the Hypolimnion consume nutrients and produce oxygen.
4. The temperature in the Hypolimnion experiences a steep fall with increasing depth.

• A. ii only
• B. iv only
• C. All
• D. iii only

Answer 1

Answer:

A. ii only

• The Hypolimnion represents the deepest layer of a thermally stratified lake.

• It is known for its cold, stagnant (non-circulating) water.

• While decomposition occurs here, consuming organic matter that sinks from the upper layers, this process significantly depletes the available oxygen.

• Consequently, the Hypolimnion is typically characterized by low oxygen concentrations.