#Question id: 10465
#Unit 6. System Physiology – Plant
This feature is an adaptive, as the redistribution of
chloroplasts within the cells modulates light absorption and prevents
photodamage, diagram shows of chloroplast distribution patterns in Arabidopsis
palisade cells in response to different light intensities;
m) A-low light, B-high light, C-darkness
n) A-high light, B-darkness, C-low light
Based on the above light intensities, each shows
different chloroplasts position such as,
i) chloroplasts avoid sunlight by migrating to the
side walls of palisade cells
ii) chloroplasts move to the bottom of the cell,
although the physiological function of this position is unclear
iii) chloroplasts optimize light absorption by
accumulating at the upper and lower sides of palisade cells
Which of the following correct combinations shows light intensities and chloroplast movements?
#Question id: 10466
#Unit 6. System Physiology – Plant
In Arabidopsis, phot1 mutants have a normal avoidance response and a poor accumulation response, phot2 mutants lack the avoidance response but retain a fairly normal accumulation response, while phot1/phot2 double mutant lack both the avoidance and accumulation responses. These results indicate that,
#Question id: 10467
#Unit 6. System Physiology – Plant
The COP1-SPA complex acts as a positive regulator as well as acts as negative regulator by shown in statements;
a) Act as negative regulator−that targets transcription factors for degradation during phytochrome and cryptochrome responses
b) Acts as a positive regulator−that targets transcription factors for degradation during phytochrome and cryptochrome responses
c) Acts as a negative regulator− during UV-B signaling by interacting with the C-terminal region of UVR8 in the nucleus UVR8- COP1-SPA complex then activates the major transcription factor HY5, which controls the expression of many of the genes induced by UV-B
d) Acts as a positive regulator during UV-B signaling by interacting with the C-terminal region of UVR8 in the nucleus UVR8- COP1-SPA complex then activates the major transcription factor HY5, which controls the expression of many of the genes induced by UV-B
Whichof the following combination from avbove statements of UVR8 is true?
#Question id: 10468
#Unit 6. System Physiology – Plant
Why are stomata required in leaf surface?
#Question id: 10469
#Unit 6. System Physiology – Plant
When aquatic plants are kept in terrestrial habitat; what adaptations do these plants develop themselves?
#Question id: 10470
#Unit 6. System Physiology – Plant
when the environmental stimuli associated with high CO2 demand inside the leaf are transduced into