Question:

Which of the following statements about plasmolysis is/are true? I .$\quad$ Plasmolysis occurs when water moves into the cell II. $\quad$Cells shrink in hypotonic solutions III.$\quad$ If the external solution balances the osmotic pressure of the cytoplasm,it is said to be isotonic

Updated On: Jun 6, 2022
  • I only
  • II only
  • III only
  • I and II only
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The Correct Option is C

Solution and Explanation

Plasmolysis occurs when water moves out of the cell and the cell membrane of a plant cell shrinks away from its cell wall. This occurs when the cell is placed in hypertonic solution (i.e., solution having more concentration of solute than cytoplasm). In plasmolysis, water is first lost from cytoplasm and then from the vacuole and causes the protoplast to shrink away from the walls.
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Top Questions on Transport in Plants

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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