Question

If a short day plant is given ten hours light and fourteen hour darkness but the dark period is interrupted in the middle by a flash of $730nm$ wavelength of light, then

• A. The floral axis becomes inactive
• B. The plant produces flowers
• C. Production of flowers is delayed, the process is suspended for that period of time
• D. The plant will produce parthenocarpic fruits

Answer 1

Answer: (C)

Production of flowers is delayed, the process is suspended for that period of time

If for a short day plant the period of long night is interrupted by a flash of 730nm, absorbed by $P_{fr}$ which gets converted to $P_r$ an inactive form of phytochrome, flowering does not occur

So, the correct answer is 'Production of flowers is delayed, the process is suspended for that period of time'