Nuisance growth of aquatic plants and bloom-forming algae in natural waters are generally due to high concentrations of:
a. carbon
b. sulphur
c. calcium
d. phosphorus
The answer is the option (d) phosphorus
High levels of dissolved organic and inorganic nutrient elements, such as phosphorus, cause bloom-forming algae and aquatic plants to proliferate invasively in natural water bodies. Hence, (d) is the correct option.