Multiple Choice QuestionsTracheids differ from other treachery elements
having Casparian strips
being imperforate
lacking nucleus
lacking nucleus
Root pressure develops due to
active absorption
low osmotic potential in soil
passive absorption
passive absorption
A column of water within xylem vessels of tall trees does not break under its weight because of
Dissolved sugars in water
Tensile strength of water
Lignification of xylem vessels
Lignification of xylem vessels
B.
Tensile strength of water
A column of water within xylem vessels of tall tree does break under its weight because of high tensile strenght of water, i.e. an ability to resist a pulling force. This high tensile property depends on cohesion, adhesion and surface tension property of water. Due to these forces only transpiration drive ascent of xylem sap occurs.
A protoplast is a cell
without plasma membrane
without nucleus
undergoing division
undergoing division
Which one of the following is correctly matched?
Passive transport of nutrients - ATP
Apoplast - Plasmodesmata
Potassium-Readily mobilization
Potassium-Readily immobilization
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs
as bicarbonate ion
in the form of dissolved gas molecules
by binding to RBC
by binding to RBC
Transpiration and root pressure cause water to rise in plant by?
pulling it upward
pulling and pushing it, respectively
pulling it upward
pulling it upward
In a ring girdled plant
the shoot dies first
the root dies first
the shoot and root die together
the shoot and root die together
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
Switch
