There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon? 1) Discharge of nutrients from the estuaries. 2) Run-off from the land during the monsoon. 3) Upwelling in the seas. Select the Correct answer from the codes given below:

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CollectorBabu · Accepted Answer

Correct Answer: 1, 2 and 3. Algal bloom appears due to increase or accumulation in population of algae in water system which occurs mostly in freshwater and in marine environments. Algal blooms due to excess of nutrients, like phosphates originate from fertilizers and household cleaning products which enters the watersheds through water runoff. With excess carbon and nitrogen, residual sodium carbonate acts as catalyst for algae to bloom by dissolving carbon dioxide for enhanced photo synthesis with nutrients. Due to phosphates in water systems, increase growth of algae and plants causes decay which consumes dissolved oxygen in water, resulting in hypoxic conditions. Further it is noticed that Upwelling, formation of mud banks, nutrient discharges from estuaries and run-off from the land during southwest and northeast monsoons cause some algae blooms in coastal waters.

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