The cause of guttation is
a) Transpiration
b) higher root pressure
c) high root temperature
d) obstructed xylem
Guttation occurs when plants absorb water by
a) active absorption
b) passive absorption
c) root pressure
d) both a and b
The metal ion involved in stomatal regulation is………
a) Iron
b) magnesium
c) zinc
d) potassium
Increase in CO2 concentration around leaf causes …………
a) rapid opening of stomata
b) partial closure of stomata
c) complete closure of stomata
d) there will be no effect on stomatalopening
Which percentage of water absorb by herbaceous plants is lost during transpiration?
a) 90
b) 70
c) 30
d) 10
Stomata open during the day time because the guard cells………
a) photosynthesize and produce osmotically active sugars
b) thick walled
c) C shaped
d) covers
