Question

Addition of phosphate and nitrate/fertilizers into water leads to:

• A. increased growth of decomposers
• B. reduced of algae growth
• C. increased growth of algae
• D. nutrient enrichment

Answer 1

Answer: (C)

increased growth of algae

Unlike temperature and dissolved oxygen, the presence of normal levels of nitrates usually does not have a direct effect on aquatic insects or fish. However, excess levels of nitrates in water can create conditions that make it difficult for aquatic insects or fish to survive.

Algae and other plants use nitrates as a source of food. If algae have an unlimited source of nitrates, their growth is unchecked.