An algal bloom is a rapid increase or accumulation in the population of algae in a water system Whic...........

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An algal bloom is a rapid increase or accumulation in the population of algae in a water system. Which of the following statements are correct with respect to the algal blooms?

1. Algal Bloom creates dead zones in the water.

2. It occurs when nutrients mainly phosphorus, nitrogen, and carbon flows down the river and overfeeds’ the algae.

3. Presence of residual sodium carbonate acts as catalyst for the algae to bloom by providing dissolved oxygen for enhanced photosynthesis in the presence of nutrients.

Select the correct answer from the codes given below

2 and 3 only

2 only

1 and 2 only

All of the above

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Explanation:

An algal bloom is a rapid increase or accumulation in the population of algae (typically microscopic) in a water system. Algal blooms may occur in freshwater as well as marine environments. Freshwater algal blooms are the result of an excess of nutrients, particularly phosphates. Presence of residual sodium carbonate acts as catalyst for the algae to bloom by providing dissolved carbon dioxide for enhanced photosynthesis in the presence of nutrients.