Question

Which of these process accelerate the productivity of ponds and lakes due to excess nutrients?

• A. Transpiration
• B. Eutrophication
• C. Oligotrophication
• D. Deforestation

Hint:

Eutrophication = "Well-nourished." It is a double-edged sword in aquaculture. We want some nutrients for fish food, but "too much of a good thing" leads to toxic blooms and oxygen crashes.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks for the name of the environmental process where an overabundance of nutrients (like nitrogen and phosphorus) leads to an excessive growth of algae and plants, thereby altering the productivity and health of a water body.

Step 2: Detailed Explanation:

• Eutrophication: This is the process of nutrient enrichment of a water body. While "cultural eutrophication" (caused by human activities like fertilizer runoff or sewage) is seen as a problem, the term generally describes the transition of a water body from a low-nutrient (oligotrophic) to a high-nutrient (eutrophic) state.

• Impact: The excess nutrients trigger a "bloom" of phytoplankton. While this initially increases primary productivity, it often leads to negative consequences:
- Reduced light penetration due to thick algae mats.
- Massive oxygen depletion (hypoxia) when the algae die and decompose.
- Potential fish kills.

• Oligotrophication (Option C): This is the opposite process, where nutrient levels decrease, leading to very clear water with low biological productivity.

• Transpiration (Option A): This is the biological process of water vapor loss from plant leaves, unrelated to nutrient-driven aquatic productivity.

Step 3: Final Answer:
The process is Eutrophication.