Question

Julio wants to study the effect of water temperature on the hatching of fish eggs in a lake. Which of these experimental designs would be most practical for Julio? A. He should put fish eggs in aquariums of lake water kept at different temperatures and observe. B. He should build a computer model of fish eggs in a lake that has many different water temperature settings. C. He should use cameras to observe fish hatching in the lake and temperature probes to monitor water temperature. D. He should take water samples from lakes of different temperatures and observe for eggs and newly hatched fish.

Answer 1

The most practical experimental design among the given choices is the first choice. That is to keep the temperature of the aquarium and determine the hatching of the eggs. This way, the variable being varied is only one. That is the temperature. 

Answer 2

The correct answer is option A. He should put fish eggs in aquariums of lake water kept at different temperatures and observe.

For the observation of the effect of the temperature on the hatching of the fish eggs, one must study the fish in a controlled system. The aquarium filled with lake water and adjusted on different system can be best option for the study of the fish egg hatching at different temperature. In the aquarium, the eggs can be easily observed and the temperature can be easily controlled. In other condition, the chances of error are very high.