Question:

If $DPD$ represents diffusion pressure deficit, $OP$ is the osmotic pressure and $TP$ is the turgor pressure, then which of the following equations is correct ?

Updated On: Jul 6, 2022
  • $DPD = OP = TP$
  • $DPD = OP + TP$
  • $DPD = OP-TP$
  • $DPD = OP$
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The Correct Option is C

Solution and Explanation

The reduction in the diffusion pressure of water in a solution over its pure state is called diffusion pressure deficit or $DPD$. Diffusion pressure deficit is also called suction pressure. Its value is equal to the osmotic pressure or potential $(OP)$ (positive value taken in bars or atm) of the solution in a cell or system minus the wall pressure $(WP)$ ($=$ turgor pressure, $TP$) which opposes the entry of water into it provided the external water is pure. $DPD = OP - WP ( = TP)$ Water is absorbed by a system having higher $DPD$ from another system with lower $DPD$.
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Top Questions on Transport in Plants

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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