Under moderate excess light Quantum efficiency decreases , but the maximum photosynthetic rate remains unchanged and caused by the diversion of absorbed light energy toward heat dissipation—hence the decrease in quantum efficiency this term is known as

#Question id: 10499

#Unit 6. System Physiology – Plant

Stomata from intact, attached leaves of Arabidopsis illuminated with blue, red, and green light in a growth chamber, increases and decreases their aperture in response to light.

Find the CORRECT statements from the above graph.

i) Stomatal aperture increases when the green light is turned off, and close when the green light is turned on again

ii) Stomata from the phototropin-less double mutant phot1/phot2 respond to blue light and open further when green light is turned off

iii) stomata from the zeaxanthin less mutant npq1 do not respond to blue light and least effect to opening of the stomata further when green light is turned off

iv) the npq1 mutant and phot1/phot2 double mutant response indicate that the green reversal of the blue-light response requires zeaxanthin but also phototropin

#Question id: 10500

#Unit 6. System Physiology – Plant

Orange carotenoid protein (OCP) is involve in the photoprotection, these protein complex function as light intensity sensor provides;

#Question id: 29491

#Unit 6. System Physiology – Plant

#Question id: 29492

#Unit 6. System Physiology – Plant

HIR promotes

#Question id: 29493

#Unit 6. System Physiology – Plant

As shading increases, the R:FR ratio decreases leads to

#Question id: 29494

#Unit 6. System Physiology – Plant

Mutants lacking phyA