Answer: The presence of farm will decrease the oxygen concentration in the ponds.
Step-by-step explanation:
The farmers will use fertilizers and pesticides in farms to reduce the growth of insects and pests and to enhance the overall quality of crops.
The fertilizers contains nitrogen and phosphorous in the farm which will go in the nearby ponds. The phosphorous in water increases the growth of algae in water.
The algae will use the dissolved oxygen in water and hence, the oxygen concentration of ponds will decrease.