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Question

Identify the process taking place in this experiment.
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A
Ringing experiment for translocation of sap
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B
Demonstration of root pressure
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C
Eosin test to demonstrate ascent of sap
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D
Demonstration of transpiration
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Solution

The correct option is A Ringing experiment for translocation of sap
  • The demonstration in the experiment is a ringing experiment for the translocation of sap.
  • Translocation is the process of transporting liquids from leaves to other tissues throughout the plant. Movement of water from the soil to the leaves is done in xylem vessels.
  • Organic materials mainly produced in the leaves are moved around the plant in the living cells of the phloem.
  • Unlike xylem, which is composed of dead cells, the phloem is composed of living cells that transport sap. The water-based solution rich in sugars made by the process of photosynthesis is called sap.
  • In the ringing experiment, a ring of bark is scraped away that also removes the phloem.
  • After a while sugar is transported down the stem but it is stopped by the ring. This means, a bulge above the ring forms of sugar. This suggests that sugar moves down the stem in the phloem.
    So, the correct answer is option A.

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