To prevent algae growth, which action is most appropriate?

To prevent algae growth, which action is most appropriate?

• A. Line the bottom
• B. Chlorinate
• C. Add nutrients
• D. Cover the impoundment

Answer: (D)

The main idea is that algae need light to photosynthesize and grow. If you cover the water body, you block sunlight, so algae can’t photosynthesize effectively and their growth is greatly reduced. Among the options, covering the impoundment directly eliminates the light source that fuels algae, making it the most effective preventive measure. Lining the bottom doesn’t reduce light exposure or nutrient availability in the water. Chlorination is a treatment that kills algae but doesn’t prevent new growth, and it requires ongoing dosing. Adding nutrients would actually promote algae growth. So, blocking light by covering the impoundment best prevents algae from taking hold.

The main idea is that algae need light to photosynthesize and grow. If you cover the water body, you block sunlight, so algae can’t photosynthesize effectively and their growth is greatly reduced. Among the options, covering the impoundment directly eliminates the light source that fuels algae, making it the most effective preventive measure.

Lining the bottom doesn’t reduce light exposure or nutrient availability in the water. Chlorination is a treatment that kills algae but doesn’t prevent new growth, and it requires ongoing dosing. Adding nutrients would actually promote algae growth. So, blocking light by covering the impoundment best prevents algae from taking hold.