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Transport In Plants

Question
CBSEENBI11026029
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Most accepted theory for ascent of sap is

  • capillarity theory

  • root pressure theory

  • pulsation theory

  • transpiration pull theory

Solution

D.

transpiration pull theory

Transpiration pull is the tension, which develops due to transpiration. It has been demonstrated and evidenced, that rate of water absorption and hence, ascent of sap closely follows the rate of transpiration.

Cohesion and Transpiration pull theory, given by Dixon and Jolly (1894) is the most accepted theory tor ascent of sap.

Some More Questions From Transport in Plants Chapter

Which force is first operative in translocation of water through capillarity : cohesive force or adhesive force ?

Name the driving force for water movements in plants.

What are the two factors which affect osmosis?

What is the condition of having more stomata on the lower surface called? 

Name the plant having more stomata on lower surface than on upper surface.

Name the plant having equal number of stomata on both surfaces.

Name the substance which has maximum imbibition capacity.

Rubber cannot imbibe water. Name the solvent which can be imbibed by it.

What is pressure potential ?

If the osmotic potential is - 0.1 then what will be the value of osmotic pressure.

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