Concept:Vegetative growth in ponds refers to the growth of aquatic plants and algae, which changes the condition of the water.
Explanation:This growth, especially algae, makes the pond water appear green or cloudy.
Cloudiness caused by tiny plants and suspended particles is called turbidity.
So, vegetative growth directly increases the turbidity of pond water.
It does not mainly help fish move easily, control acidity, or stabilise temperature.
Answer:C. increases pond water turbidity