Question

The diagram given below represents the simple ringing or girdling experiment. Bark containing phloem is removed. This experiment proves and justify that phloem is the path for translocation of food. In the given diagram, swollen part of stem has been indicated.

Choose the correct option for the formation of the swollen part of stem.

• A. Accumulation of food material just above the ringing space
• B. Accumulation of minerals and water just above the ringing space
• C. Due to a repairing mechanism
• D. Injured part undergoes turgor change

Answer 1

Answer: (A)

Option (a) is correct. In girdling or ringing experiment, the path of organic nutrients in the stem of plant is represented, which is carried out by phloem. In the experiment, a ring of bark along with phloem is cut from the stem.
Due to the absence of phloem in the ringing part, translocation of food does not take place and gets accumulated above the ring. Bark also swells up and may rise to adventitious roots. Ascent of sap in plants can be demonstrated by girdling experiment.