Which statement is an example of a hypothesis that can be tested through experimentation? A) The number of times a dog wags its tail is a direct measure of how happy the dog is. B) Is the ability of a fish to taste food affected by how clear the water is where it lives? C) A plant’s fear of herbivores increases as the plant grows older. D) Bacterial growth will rapidly increase as the temperature increases.
The Correct Answer and Explanation is:
The correct answer is D) Bacterial growth will rapidly increase as the temperature increases.
Explanation:
A hypothesis is a testable statement that can be evaluated through observation or experimentation. To be considered scientific, a hypothesis must be measurable, falsifiable, and clearly defined. In this case, the statement “Bacterial growth will rapidly increase as the temperature increases” is a testable hypothesis because it involves two measurable variables: bacterial growth and temperature.
Bacterial growth can be quantitatively measured, for instance, by counting the number of bacterial colonies or observing the rate of cell division. Temperature is another variable that can be controlled and altered in a laboratory setting, allowing researchers to design an experiment where they vary temperature conditions and observe the impact on bacterial growth. This direct relationship can be measured and plotted, making the hypothesis both testable and falsifiable.
Now, let’s break down the other options:
- A) The number of times a dog wags its tail is a direct measure of how happy the dog is: While this statement might seem plausible, it is difficult to measure “happiness” objectively, and “tail wagging” does not necessarily correspond to a measurable definition of happiness. This hypothesis lacks clarity in defining how happiness would be quantified, making it hard to test experimentally.
- B) Is the ability of a fish to taste food affected by how clear the water is where it lives?: This is a question, not a hypothesis. A hypothesis must be a declarative statement that can be tested, such as “The ability of a fish to taste food decreases as the water clarity increases.”
- C) A plant’s fear of herbivores increases as the plant grows older: This statement is problematic because plants do not have emotions like “fear.” The concept of fear is not scientifically applicable to plants, making this statement impossible to test.
In conclusion, Option D is the only hypothesis that is clear, measurable, and testable through controlled experimentation.