Question

From the following list identify the region that has low chlorophyll and low nutrients.

• A. Upwelling, anticyclonic eddy
• B. Upwelling, cyclonic eddy
• C. Downwelling, anticyclonic eddy
• D. Downwelling, cyclonic eddy

Hint:

Upwelling + cyclonic eddy = nutrient-rich, productive waters. Downwelling + anticyclonic eddy = nutrient-poor, oligotrophic waters.

Answer 1

The Correct Option is C

Step 1: Recall effect of upwelling and downwelling.
- Upwelling: Brings nutrient-rich deep water to surface → high chlorophyll, high productivity. - Downwelling: Pushes surface water downward → reduces nutrient availability at surface → low chlorophyll.
Step 2: Recall role of eddies.
- Cyclonic eddy: Associated with divergence and upwelling → enhances productivity. - Anticyclonic eddy: Associated with convergence and downwelling → nutrient-poor, low productivity.
Step 3: Combine.
- Downwelling + Anticyclonic Eddy = low nutrients + low chlorophyll. Final Answer: \[ \boxed{\text{(C) Downwelling, anticyclonic eddy}} \]