Microscopically increased loss of water and loss of turgor become visible as a

Microscopically increased loss of water and loss of

This preview shows page 2 - 5 out of 6 pages.

you can see the effects of loss of turgor in wilted house plants or limp lettuce. Microscopically, increased loss of water and loss of turgor become visible as a withdrawal of the protoplast from the cell wall (plasmolysis) and as a decrease in the size of the vacuole (Figure 1).
Image of page 2
Figure 1. Plasmolysis in an epidermal cell of a leaf. (a) Under normal conditions, the plasma membrane is pressed against the cell walls. A large vacuole occupies the center of the cell, pushing the cytoplasm and nucleus to the periphery. (b) When the cell is placed in a solution with a higher concentration of solutes than that of the cell, water passes out of the cell, and the cell contents contract. (c) In an even more concentrated solution, the cell contents contract still further. Directions: 1. Obtain a leaf from the tip of an Elodea plant. Place it in a drop of water on a slide, cover it with a coverslip, and examine the material first at low power (100X) and then at high power (400X). Locate a region of healthy cells and sketch a few adjacent cells in the left box of Table 2 below. Note especially the location of the chloroplasts. (Don’t forget to include magnification.) For the next step, do NOT move the slide. 2. While touching one corner of the coverslip with a piece of Kimwipe to draw off the water, add a drop of concentrated salt solution to the opposite corner of the coverslip. Be sure that the salt solution moves under the coverslip. Wait about 5 minutes, then examine as before. Sketch in the right box one the following pages the same cells you sketched in step 1.
Image of page 3
TO HAND IN, LAB 2 NAME: ________________________________ Complete the tables below and answer the questions.
Image of page 4
Image of page 5

You've reached the end of your free preview.

Want to read all 6 pages?

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes