The cylinders in this experiment represent a 24-hour period. The light area represents light periods during a 24-hr. period and the dark area represents dark periods during a 24-hr. period. The critical length of dark vs. light periods for flowering is depicted by the dotted line. Note that some plants are flowering and some are not flowering. Study the results of this experiment on photoperiodism and flowering to determine whether the following statements are true or false.
-Short-day plants flower when the day length is shorter than the critical length,but the required dark period is interrupted by a flash of light.

Question

Quizplus · Accepted Answer

Short-day plants require uninterrupted darkness to flower. A flash of light during the dark period can prevent flowering by interrupting the necessary dark period.

The Cylinders in This Experiment Represent a 24-Hour Period