Discussion
Excess growth of aquatic plants in our water bodies is due to .............
Answer: C
Excess growth is due to an increase in nitrates and phosphates.
Nitrates and phosphates from fertiliser run-off, sewage and detergents are plant nutrients. When they build up in lakes and ponds, algae and aquatic plants grow excessively, a process called eutrophication, which reduces oxygen and harms aquatic life.
Nitrates or phosphates alone each give only part of the cause, and sodium is not a limiting nutrient for plant growth.
Algal blooms block sunlight, and when the algae die their decomposition uses up dissolved oxygen, which kills fish and other aquatic life.
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