Experiment: To study circadian rhythm, rats were kept in constant darkness for two weeks. Their activity levels were monitored using motion sensors.Observation: The rats maintained a ~24-hour activity cycle despite no light cues.Question: What does this show?
Correct answer: C. Circadian rhythms are internally regulated by biological clocks.
- A. External light is necessary for circadian rhythms to function.
- B. Darkness stops circadian rhythms from occurring.
- C. Circadian rhythms are internally regulated by biological clocks.
- D. Motion sensors affect circadian rhythm patterns in rats.
Explanation
The correct answer is that circadian rhythms are internally regulated by biological clocks. The experiment showed that the rats maintained a 24-hour activity cycle despite being in constant darkness, indicating that their circadian rhythms were not dependent on external light cues. The other options are incorrect because they misinterpret the results of the experiment or introduce irrelevant factors like sleep disruption or halting of biological activity.
Last updated
Related questions
48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?
A ballet dancer of mass 80 kg and a wingspan of 1m is executing a spin. She then folds her arms and brings them to within 20cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?