How do fish help plants in an aquaponics system?

How do fish help plants in an aquaponics system?

• A. They eat bugs that harm the plants
• B. They eat debris that cleans the water
• C. They produce waste which acts as nutrients for the plants
• D. They keep harmful viruses that could harm the plants

Answer: (C)

In an aquaponics system, the fish waste provides the nutrients that plants need. Fish excrete waste that contains ammonia, and beneficial bacteria in the system transform that ammonia first into nitrite and then into nitrate. Plants absorb nitrate (and some ammonium) through their roots to grow. So the fish are effectively supplying fertilizer, and the plants are cleaning the water by taking up those nutrients. This creates a self-contained nutrient loop where fish waste becomes plant food, and the plants help keep the water safe for the fish by removing excess nutrients. The other ideas don’t describe where the plant nutrients come from: while some fish may eat pests, that isn’t how plants get their fertilizer; debris removal isn’t the main water-cleaning mechanism (that’s the combined action of bacteria and plant uptake); and viruses aren’t a controlled nutrient source and aren’t the basis of how plants are fed in this setup.

In an aquaponics system, the fish waste provides the nutrients that plants need. Fish excrete waste that contains ammonia, and beneficial bacteria in the system transform that ammonia first into nitrite and then into nitrate. Plants absorb nitrate (and some ammonium) through their roots to grow. So the fish are effectively supplying fertilizer, and the plants are cleaning the water by taking up those nutrients. This creates a self-contained nutrient loop where fish waste becomes plant food, and the plants help keep the water safe for the fish by removing excess nutrients.

The other ideas don’t describe where the plant nutrients come from: while some fish may eat pests, that isn’t how plants get their fertilizer; debris removal isn’t the main water-cleaning mechanism (that’s the combined action of bacteria and plant uptake); and viruses aren’t a controlled nutrient source and aren’t the basis of how plants are fed in this setup.