Among lakes, primary productivity seems to be mainly controlled by levels of
A) light.
B) pollutants.
C) temperature.
D) nutrients.
E) None of the choices are correct.

Question

Quizplus · Accepted Answer

Primary productivity in lakes is mainly controlled by levels of nutrients, particularly phosphorus and nitrogen, as they are key elements needed for photosynthesis by aquatic plants and algae. Light availability and temperature can also have an impact, but nutrient availability is typically the most important factor. Pollutants can also affect primary productivity, but they do so indirectly by altering nutrient levels or other environmental factors.

Among Lakes, Primary Productivity Seems to Be Mainly Controlled by Levels