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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 refrective index

D

The absence of sugar

Text Solution

Verified by Experts

The correct Answer is:
B
The phloem sap is alkaline in nature. It continuously pumps protons from its companion cells to the other neighbouring cells during transportof sugars.
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NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-TRANSPORT IN PLANTS -Exercise
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  2. Water vapour comes out from the plant leaf through the stomatal openin...

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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. Root pressure develops due to

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

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

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  7. In land plants the guard cells differ from other epidermal cells in ha...

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  8. Guard cells help in

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

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

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

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  12. Stomata of a plant open due to

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  13. Stomata of CAM plants

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  14. Opening and closing of stomata is due to

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  15. Glycolate induces opening of stomata in

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  16. Which of the following have sunken stomata

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  17. Water enters a cell due to

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  18. Storage capacity of the soil is the extent to which it can hold In s...

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  19. Water potential and osmotic potential of pure water are

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  20. If turgidity of a cell surrounded by water increases, the wall pressur...

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