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The most widely accepted theory of ascen...

The most widely accepted theory of ascent of sap in trees is

A

Capillarity

B

Role of atmospheric pressure

C

Pulsating action of living cell

D

Transpiration pull and cohesion theory of Dixon and Joly

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The correct Answer is:
D
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DINESH PUBLICATION ENGLISH-TRANSPORT IN PLANTS-REVISION QUESTIONS FROM COMPETITIVE EXAMS
  1. Rate of water absorption can be increased through (a) Decreased trans...

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  2. Water in plants is transported by or ascent of sap take place through

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  3. The most widely accepted theory of ascent of sap in trees is

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  4. Water rises in the stem due to

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  5. According to one vital force theory, ascent of sap is due to active pu...

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  6. At what time, the stomatal transpiration is completely stopped

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  7. Upward movement of water through xylem is best explained by (a) Cohes...

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  8. The principal pathway of water translocation in angiosperms is

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  9. The cohesive force bof water is due to

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  10. When pheloem is removed by girdling

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  11. During osmosis, flow of water through a semipermeable membrane is

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  12. Diffusion of water through selectively permeable membrane is

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  13. A higher plant cell covered with cutin and suberin is placed in water....

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  14. Water is absorbed from outside solution only when it is

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  15. Supply of excess fertilizer and watering of a grass lawn causes brown...

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  16. During water absorption by roots , water potential of cell sap is lowe...

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  17. Comment upon the following : When a plant cell is kept in hypertonic...

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  18. 0.1 M solution of a solute has a water potential of

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  19. The movement of free atoms from higher concentration to lower concentr...

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  20. In seed germination the first to occur is

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