Question:

Cohesion, adhesion and surface tension give high tensile strength to water. Capillarity is aided by small diameter of the tracheary elements.

Updated On: Jul 6, 2022
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is B

Solution and Explanation

Transpiration pull or cohesion - tension theory is based upon the cohesive and adhesive properties of water molecules, which forms the unbroken continuous water column in the xylem. Water molecules are held together by strong cohesion force which is due to hydrogen bonds amongst them. There is another force of adhesion which holds water to the walls of xylem vessels. Water molecules are attracted to one another more than the water molecules in the gaseous state. It produces surface tension that accounts for high capillarity through tracheids and vessels. Water column is present in tracheary elements. There is a continuous column of water from roots through the stem and into the leaves. These tracheary elements form this continuous system through their unthickened areas. Since, a large number of tracheary elements are present together, no breakage in the continuity of water occurs even if there is a blockage of one or few of them.
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Notes on Transport in Plants

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