Question:

Which of the following is done during ringing experiment ?

Updated On: Aug 1, 2022
  • bark is removed
  • pith is removed
  • xylem is removed
  • all of these
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The Correct Option is D

Solution and Explanation

Ringing experiment is performed to study the path of translocation of food and water in plants. In ringing experiment, if ring or girdle of bark (phloem + cortex) is removed from a dicot plant, the leaves in upper part do not wilt because water continues to rise up through central xylem. In second set of experiment, when central portion (xylem) of dicot stem is removed, leaves in upper part wilt as water is unable to rise up. This shows the path of water translocation is xylem. When phloem + cortex is removed downwards food translocation stops.
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Concepts Used:

Transport in Plants

The two types of conducting tissues that are used to transport the water and minerals in plants such as:

Xylem:

Xylem is a long, non-living tube running from the roots to the leaves via the stem. The water is absorbed by the root hair and goes through cell-to-cell movement by osmosis until it reaches the xylem. This water is then transported throughout the xylem vessels to the leaves and is evaporated by the process of transpiration.

The xylem is also composed of lengthened cells like the phloem. However, the xylem is mainly accountable for transporting water to all plant parts from the roots. Since they serve such a vital function, a single tree would have a lot of xylem tissues.

Phloem:

The phloem is accountable for the translocation of nutrients and sugar like carbohydrates, produced by the leaves to areas of the plant that are metabolically in force. It is powered by living cells. The cell walls of these cells structurize small holes at the ends of the cells known as sieve plates.

Means of Transportation in Plants:

Transportation in plants is by 3 means, they are as follows:

  • Diffusion
  • Facilitated diffusion
  • Active Transport