Question

Primary productivity in temperate regions is limited by :___________ a.) sunlight b.) nutrients c.) depends on the season d.) depends on the fish

Answer 1

In temperate regions, primary productivity is primarily limited by nutrients, such as nitrogen and phosphorus. Algal blooms caused by excessive input of nutrients can reduce light penetration in water and deplete oxygen, harming aquatic organisms.

Step-by-step explanation:

In temperate regions, primary productivity is primarily limited by nutrients. While sunlight is a necessary factor for photosynthesis, it is generally abundant in these regions. However, the availability of nutrients, such as nitrogen and phosphorus, can be limited and restrict the growth of primary producers like phytoplankton and aquatic plants.

For example, lakes and ponds in temperate regions can experience algal blooms when there is a large input of nitrogen and phosphorus from sewage and runoff. These algal blooms can reduce light penetration in the water, making it difficult for photosynthetic plants to survive. When the algae die and decompose, oxygen depletion occurs, which can harm fish and other organisms that require oxygen.

Therefore, the correct answer is b.) nutrients.