In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the 1. decomposer microorganisms to the surface. 2. nutrients to the surface 3. Bottom-dwelling organisms to the surface. W

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Q: 22 (IAS/2011)
In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the
1. decomposer microorganisms to the surface.
2. nutrients to the surface
3. Bottom-dwelling organisms to the surface.
Which of the statements given above is/ correct?

question_subject: 

Ecology

question_exam: 

IAS

stats: 

0,224,262,95,224,138,29

keywords: 

{'ecosystem productivity': [0, 0, 0, 1], 'marine upwelling zones': [0, 0, 0, 1], 'decomposer microorganisms': [0, 0, 0, 1], 'marine productivity': [0, 0, 0, 1], 'organisms': [4, 1, 3, 2], 'nutrients': [1, 0, 3, 1], 'surface': [1, 0, 0, 0]}

The correct statement is 2 only.

Marine upwelling zones are important for ecosystem productivity because they bring nutrients from the ocean floor to the surface waters. These nutrients include nitrogen, phosphorus, and other micronutrients that are essential for the growth of phytoplankton, the base of the marine food web. The nutrients are brought up to the surface by ocean currents, winds, and other factors that cause deep water to rise to the surface.

Statement 1 is incorrect because decomposer microorganisms are not typically brought to the surface in upwelling zones. Decomposers are important for breaking down dead organic matter, but they are not directly involved in ecosystem productivity in the same way that nutrients are.

Statement 3 is also incorrect because upwelling zones do not typically bring bottom-dwelling organisms to the surface. Upwelling zones may bring some organisms up from deeper waters, but the primary effect is the nutrient enrichment of surface waters, which stimulates the growth of phytoplankton.