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A few drops of sap were collected by cut...

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ?

A

Acidic

B

Alkaline

C

Low refractive index

D

Absence of sugar

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE-TRANSPORT IN PLANTS -Assignment (Section C) Previous Year Questions
  1. Which of the following facilitates opening of stomatal aperture ?

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  2. The water potential of pure water is

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  3. A few drops of sap were collected by cutting across a plant stem by a ...

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  4. Water vapour comes out from the plant leaf through the stomatal openin...

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  5. Root pressure develops due to

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  6. A column of water within xylem vessels of tall trees does not break un...

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  7. Transpiration and root pressure cause water to rise in plants by

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  8. In a ring girdled plant :

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  9. Which one gives the most valid and recent explanation for stomatal mov...

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  10. Which of the following criteria does not pertain to facillatated trans...

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  11. Lenticels are involved in

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  12. Guttation is the result of

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  13. Which one of the following structures between two adjacent cells is an...

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  14. Given below is the diagram of a stomatal apparatus . In which of the f...

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  15. Guard cells help in

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  16. The rupture and fractionation do not usualy occur in the water column ...

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  17. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, ...

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  18. The translocation of organic solutes in sleve tube membres is supportt...

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  19. Potometer works on the principle of

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  20. When water enters in roots due to diffusion, it is termed as

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