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Which of the following is a method for managing the excess algae in marine ecosystem?

(a) Drainage

(b) Harmful algal blooms

(c) Bio-remediation

(d) Bio-degradation

I had been asked this question in an online interview.

Question is from Microalgal Species for Aquaculture in chapter Biotechnological Approaches of Microalgal Culture of Environmental Biotechnology

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The correct answer is (a) Drainage

The best I can explain: Drainage is a primary technique of controlling the soil salinity, whereas, Algal blooms produce toxins which leads to formation of dead zones in water, bio-degradation is the process that leads to degradation of compounds with the help of bacteria, Bio remediation is a process that uses microbial processes and converts toxic substances into less toxic or usable forms.

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