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As various ions from the soil are active...

As various ions from the soil are actively transported into the vascular tissues of roots, then water follows (it's potential gradient) and increase the pressure inside the xylem. This positive pressure is called.

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Root pressure.
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Positive hydrostatic pressure developing in root xylem due to active solute accumulation is called

Root hairs absorb water from soil due to (a) Osmotic pressure (b) Turgor pressure (c) Suction pressure (d) Root pressure

Which of the following gases always show positive deviation from ideal behaviour with increase in pressure ?

On a warm summer day the transpiration pull is the main force that drives from root parenchyma into the root xylem. The table shows values of Psi_(rho) (pressure potential ) and Psi_(s) (solute potential) in root xylem and root parenchyma , in kPa. In which of the options (a-d) would tranpiration pull cause water to move from root parenchyma into the root xylem?

The figure given below is a diagrammatic representation of a part of the cross section of the root in the root hair zone. Study the same and then answer the questions that follow : Due to an excess of this pressure sometimes drops of water are found along the leaf margins of some plants especially in the early mornings. What is the phenomenon called ?

What role cohesion and adhesion play in xylem transport? (a) Like transpiration, they create a tension (b) Like root pressure, they create a positive pressure (c) Like sugars, they cause water to enter xylem (d) They create a continuous water column in xylem

Consider the following statements Osmosis is a process of transport of water across a semipermeable membrane , 1. Down the water potential gradient . 2. Up the water potential gradient . 3. Actively 4. Passively Of these statements

Xylem channels of the rootlets maintain a low water potential due to (a) Maintenance of high salt content (b) Presence of negative pressure or water tension (c) Both a and b (d) Occurrence of positive pressure

Given below are assertion and reason. Assertion. When the ambient temperature is high and the soil contains exces of water, the plants tend to loss water in the form of droplets from lenticels Reason . Root pressure regulates the rate of loss of water from lenticels .

Transpiration has more than one purpose. Which of the following is not the purpose of transpiration? (a) Creates transpiration pull for absorption and transport in plants. (b) Cools leaf surfaces by evaporative cooling (c) Transports minerals from the soil to all parts of the plant. (d) Gives high tensile strength to water column present in xylem. (e) Translocation of sucrose from source to sink

ALLEN-TRANSPORT IN PLANTS-EXERCISE
  1. What is the symbiotic assication of a fungus with a root system of hig...

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  2. Name a plant seed having obligate association with the mycorrihiza mea...

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  3. As various ions from the soil are actively transported into the vascul...

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  4. Excess water collecting in the form of droplets around special opening...

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  5. From which compound plants obtain their carbon and most of their oxyge...

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  6. In root endodermis, layer of which substance provide ability to active...

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  7. The chief sinks for the mineral elements in plants are

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  8. From which part mineral ions are frequently remobilised?

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  9. Write the elements which are most readily mobilised from senescent pa...

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  10. The main component of phloem sap is

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  11. Which substances are translocated through phloem.

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  12. Which cell's turgidity causes opening or closing of stomata.

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  13. Name the external factors which affect the rate of transpiration

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  14. Discuss the different environmental and plant factors affecting transp...

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  15. Ability to rise in thin tubes and ability to resist pulling force are ...

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  16. The phenomenon in which water molecules are atttracted to each other i...

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  17. An ability to resist a pulling force of water (tensile strength) is de...

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  18. The mechanism universally accepted to describe the translocation of su...

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  19. A simple experiment called is used to identify the tissues through whi...

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  20. Comparison of different mechanisms of transport

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