• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Determination of the water potential of potato tissue by a gravimetric method.

Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  • Essay length: 1378 words
  • Submitted: 17/12/2003
Share this essay:
GCSE Green Plants as Organisms

The first 200 words of this essay...

Determination of the water potential of potato tissue by a gravimetric method.

1. Explain the theory behind the experiment.

Water potential, w, is a measure of the ability of water molecules to move from one region to another. The more water molecules there are per volume of the cell the more likely that by random movement they will collide with the cell's plasma membrane, and travel out of it. Pure water has a w of 0. As all solutions have less water molecules per volume than pure water they have a lower w; therefore all solutions have negative water potentials. The net movement of water molecules is always from a region of high water potential to one of lower water potential, they move down a water potential gradient until equilibrium is reached it will be reached when the water potentials on both sides of the plasma membrane are the same.

When the potato is placed in water or a hypotonic solution its cells will swell, although they will not burst due to the cell wall, as water molecules enter the cell down a water potential gradient. The cells become turgid, with the protoplast pushed up against

Read more
The above preview is unformatted text

Found what you're looking for?

  • Start learning 29% faster today
  • Over 150,000 essays available
  • Just £6.99 a month

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.