Multiple Choice QuestionsMost accepted theory for ascent of sap is
capillary theory
root pressure theory
pulsation theory
transpiration pull
Which of the following theory gives the latest explanation for the closure of stomata?
ABA theory
Munch Theory
Starch glucose theory
Active K+ transport theory
D.
Active K+ transport theory
As per 'Active K+ transport mechanism' accumulation of K+ ions occurs in the guard cells during the day inresponse to light. It increases the turgidity of guard cells, consequently stomata open.
During night, ions move out of the guard cells into surrounding epidermal cells consequently guard cells become flaccid and stomata close.
Transpiration would be lowest when
wind velocity is high
enough water is in the soil
atmospheric RH is high
high temperature and light
Which of the following exhibits a direct porportionality to transpiration
Light and RH
Temperature and RH
Temperature and wind
RH and wind
The most important force which pulls water up in tall trees is
imbibition force
osmotic force
cohesive force
electromagnetic force
The light phase of photosynthesis is called
Hill reaction
photo action
pigment action
chlorophyllous process
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