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Water moves up against gravity and even ...

Water moves up against gravity and even for a tree of `20m`height the tip receives water within two hours . The most important physiological phenomenon which is responsible for the upward movement of water is `"______"`

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the physiological phenomenon responsible for the upward movement of water in trees, particularly in the context of a tree that is 20 meters tall. 2. **Identifying the Mechanism**: The key mechanism that facilitates the movement of water against gravity in plants is known as "transpirational pull." This process is crucial for water transport from the roots to the leaves. 3. **Role of Transpiration**: Transpiration occurs when water evaporates from the stomata (tiny openings) on the leaves. This loss of water creates a negative pressure (or tension) in the leaf, which pulls more water upward from the roots through the xylem vessels. ...
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Fluids at rest exert a normal force to the walls of the container or to the sruface of the body immersed in the fluid. The pressure exerted by this force at a point inside the liqid is the sum of atmospheric pressure and a factor which depends on the density of the liquid, the acceleration due to gravity and the height of the liquid, above that point. The upthrust acting on a body immersed in a stationary liquid is the net force acting on the body in the upward direction. A number of phenomenon of liquids in motion can be explain by Bernoulli's theorem which relates the pressure, flow speed and height for flow of an ideal incompressible fluid. A container of large uniform corss sectional area. A resting on a horizontal surface holds two immiscible, non viscous and incompressile liquids of densities d and 2d , each of height H//2 as shown in the figure. The lower density liquid is open to the atmosphere having pressure P_(0) . Situation II: A cyliner is removed and the original arrangement is restoreed.A tiny hole of area s(slt ltA) is punched on the veritical side of the containier at a height h(hltH//2) The height h_(m) at which the hole should be punched so that the liquid travels the maximum distance is

Fluids at rest exert a normal force to the walls of the container or to the sruface of the ody immersed in the fluid. The pressure exerted by this force at a point inside the liqid is the sum of atmospheric pressure and a factor which depends on the density of the liquid, the acceleration due to gravity and the height of the liquid, above that point. The upthrust acting on a body immersed in a stationary liquid is the net force acting on the body in the upward direction. A number of phenomenon of liquids in motion can be explain by Bernoulli's theorem which relates the pressure, flow speed and height for flow of an ideal incompressible fluid. A container of large uniform corss sectional area. A resting on a horizontal surface holds two immiscible, non viscous and incompressile liquids of densities d and 2d , each of height H//2 as shown in the figure. The lower density liquid is open to the atmosphere having pressure P_(0) . Situation II: A cyliner is removed and the original arrangement is restoreed.A tiny hole of area s(slt ltA) is punched on the veritical side of the container at a height h(hltH//2) The maximum distance travelled x_(m) is

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A tube of conical bore is dipped into water with apex upwards. The length of the tube is 20cm and radii at the upper and lower ends are 0.1 and 0.3 cm. Find the height to which the liquid rises in the tube ( Surface tension of water = 80 dyne // cm ).

A fish F, in the pond is at a depth of 0.8m from the water surface and is moving vertically upward with velocity 2ms^(-1) . At the same instant, a bird B is at a height of 6m from the water surface and is moving downward with velocity 3ms^(-1) . At this instant. both are on the same vertical line as shown in figure . Which of the following statements are correct?

A cylindrical tank has a hole of diameter 2r in its bottom. The hole is covered wooden cylindrical block of diameter 4r, height h and density rho//3 . Situation I: Initially, the tank is filled with water of density rho to a height such that the height of water above the top of the block is h_1 (measured from the top of the block). Situation II: The water is removed from the tank to a height h_2 (measured from the bottom of the block), as shown in the figure. The height h_2 is smaller than h (height of the block) and thus the block is exposed to the atmosphere. Find the minimum value of height h_1 (in situation 1), for which the block just starts to move up?

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NCERT EXEMPLAR ENGLISH-TRANSPORT IN PLANTS-Very Short Answer Type Questions
  1. A flowering plant is planted in an earthen pot and irrigated. Urea is ...

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  2. Absorption of water from soil by seeds increases the "" thus helping s...

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  3. Water moves up against gravity and even for a tree of 20mheight the ti...

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  4. The plant cell cytoplasm is surrounded by both cell wall and cell memb...

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  5. The C(4) plants are twice as efficient as C(3) plants in terms of fixi...

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  6. Movement of substances in xylem is unidirection while in phloem it is ...

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  7. Indentify the process occurring in I, II, and III

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  8. Given below is a table. Fill in the gaps.

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  9. Define water potential and solute potential.

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  10. Why is solute potential always negative ? Explain Psi(w)=Psi(s)+Psi(p)...

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  11. An onion peel was taken and (a) placed in salt solution for five min...

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  12. Differentiate apoplast and symplast pathways of water movement. Which ...

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  13. How does most of the water moves within the root ?

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  14. Give the location of casparian strip and explain its role in the water...

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  15. Differentiate between guttation and transpiration.

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  16. Transpiration is a necessary evil in plants. Explain

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  17. Describe briefly the three physical properties of water which helps in...

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  18. A gardener forgot to water a potted plant for a day during summer, wha...

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  19. Identify a type of molecular movement which is highly selective and re...

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  20. Correct the statements. (a) Cells shrink in hypotonic solutions and ...

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