Question:
Algal bloom is caused due to
Algal bloom is caused due to
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Nutrients from sewage and fertilisers cause eutrophication.
Updated On: Nov 12, 2026
- Large amount of nutrients in water
- Large amount of toxic material in water
- High oxygen level in water
- High microbial growth in water
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Sewage, detergents and fertiliser run-off add nutrients such as nitrates and phosphates to water.
Step 2: Eutrophication
These nutrients cause rapid overgrowth of free floating algae, which is called an algal bloom.
Step 3: Effect
The bloom colours the water, and when the algae die and decay, the oxygen level in the water falls.
Final Answer:
Algal bloom is caused by a large amount of nutrients in water. \[ \boxed{\text{(A) }\text{Large amount of nutrients in water}} \]
Sewage, detergents and fertiliser run-off add nutrients such as nitrates and phosphates to water.
Step 2: Eutrophication
These nutrients cause rapid overgrowth of free floating algae, which is called an algal bloom.
Step 3: Effect
The bloom colours the water, and when the algae die and decay, the oxygen level in the water falls.
Final Answer:
Algal bloom is caused by a large amount of nutrients in water. \[ \boxed{\text{(A) }\text{Large amount of nutrients in water}} \]
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