Nuisance growth of aquatic plants and bloom-forming algae in natural
water is generally due to high concentrations of

1. carbon

2. sulfur

3. calcium

4. phosphorus

Ans. (d) Nuisance growth of aquatic plants and bloom the forming algae in natural water bodies is generally due to the high concentration of dissolved organic and inorganic nutrients materials Phosphorus favors the growth of aquatic weed plants like Eichhornia (water hyacinth) and certain blue-green algae.
Page 276, XII NCERT