In the context of ecosystem productivity, marine upwelling zones are important as they increase marine productivity by bringing the:\n1. Decomposer microorganisms to the surface\n2. Nutrients to the surface\n3. Bottom-dwelling organisms to the surface\nWhich of the statements given above is/are correct?

Correct Option: (B) 2 only

Statement 1 and statement 3 are not correct: Microorganisms are natural decomposers as they possess an enormous ability to utilise diverse types of organic substances as a source of energy and convert toxic ones into harmless by-products. They do not have any relevance in the context of ecosystem productivity. Organisms and decomposer microorganisms would remain where they are, no movement to the surface can be noticed at the upwelling zone.\n\nStatement 2 is correct: Upwelling is an oceanographic phenomenon that involves the wind-driven motion of dense, cooler, and usually, nutrient-rich water towards the ocean surface, replacing the warmer, usually nutrient-depleted surface water. The increased availability in upwelling regions results in high levels of primary productivity and thus fishery production. Approximately 25% of the total global marine fish catches come from five upwellings that occupy only 5% of the total ocean area.