The loss of water through cuticle may reach upto :
Which ion accumulate in the guard cells at the time of opening of stomata :
Bulliform cells respond to which change?
1. Turgor pressure
2. Osmotic pressure
4. None of above.
Passive absorption of minerals depends on :
2. Temperature and metabolic inhibitor
3. Metabolic inhibitor
Dry wooden stakes if driven into a small crack in a rock and then soacked, can develop enough pressure to split the rock. Such a pressure is built up through the phenomenon of :
2. Butteress roots
3. Prop roots
4. Turgor pressure
The cohesive force existing between molecules of water is contributing to :
1. ascent of sap
To initiate cell plasmolysis, the salt concentration must be :
The most accepted theory for stomatal opening and closing is :
2. guard cell photosynthesis
3. K+ efflux and influx
4. starch glucose interconversion.
Ascent of sap is mainly attributed to :
1. cohesion force
3. root pressure
Water lost by transpiration is :
1. rich in solutes
2. rich in dissolved roots
3. rich in dissolved minerals
4. pure water.