Question:

Water rises in the stem due to:

Updated On: Jun 7, 2022
  • root pressure
  • atmospheric pressure
  • osmotic pressure
  • cohesion and transpiration pull
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The Correct Option is D

Solution and Explanation

According to Dixon and Jolly water rises in the stem due to cohesion tension produced by transpiration pull.
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Concepts Used:

Transport of Water and Minerals in Plants

Transportation is the process of movement of water and minerals to all parts of the plant body. Plants have a specialized system that enables them to distribute water and nutrients throughout their body. They use several processes such as translocation, absorption, storage and utilization of water.

Transportation in Plants:

The water and minerals are transported in plants by two types of conducting tissues:

  • Xylem: The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves.
  • Phloem: The phloem carries food downward from the leaves to the roots.

The three modes of transportation:

  • Diffusion: The molecules in this system travel from a high-concentration region to a low-concentration region. This procedure does not necessitate the use of any energy.
  • Facilitated diffusion: With the help of a carrier, usually a protein, the mechanism transports molecules from an area of higher concentration to a region of lower concentration. Because this process does not require any energy, it is referred to as a passive process.
  • Active Transport: With the help of membrane proteins, this mechanism transports molecules from a lower to a higher concentration region. Because it requires ATP to function, this system is referred to as active transport.