NEET2007BotanyPhotosynthesis in Higher PlantsActual
The wavelength of light absorbed by P _r form of phytochrome:
Options
- A680 ~nm
- B720 ~nm
- C620 ~nm
- D640 ~nm
Correct answer
A. 680 ~nm
Step-by-step solution
Light acts as a signal to initiate and regulate photoperiodism and photomorphogenesis. There are two light-sensing systems involved in these responses, the blue light-sensitive system and the red light-sensitive or phytochrome system. The action spectrum of the light needed for ( P _ r ) responses is at about 680 nm. So, the correct answer is '680 nm'