P16. Epidermis Cells

OBJECTIVES:

• Identify the shape of epidermis cells.
• Identify and explore the parts of a stoma.
• Measure dimensions of the entire cell and the stoma.

MATERIALS:

•  1 Slide
•  1 Cover slip
•  Distilled water
•  10% Salt water
•  Scissors
•  Needle

PROCEDURE:

Plant cells observation:

1. Cut the stalk of the leek.
2. In the place of the cut, pull out the transparent part of the epidermis and using forceps.
3. Using the brush, place the peel onto the slide containing a drop of tap water.
4. Take a cover slip and place it gently on the peel with the aid of a needle.
5. View it in the microscope.
6. Describe the change in the shape of the cells.
7. Draw a diagram with the parts of a stome: stoma,cell guards,epidermis cells.

Salt treatment:

1. Prepare a 10% of salt solution.
2. Put the salt with a dropper on the left part of the slide.
3. Place a piece of cellulose paper in the opposite part of the cover slip, and let the dissolution to go though your sample.

Conclusions and coments:

 

QUESTIONS:

1.        What is the major function of a cell membrane?

• Keep separate internal environment of the phospholipid layer and transport functions played by proteins. The combination of active transport and the passive transport endoplasmic make a selective barrier membrane that allows the cell differentiation medium.

2.      What is the major function of the cell wall?

• The cell wall protects the cell contents, and gives rigidity, works as a mediator in all relations of the cell with the environment and acts as a cellular compartment. In plants, defines the structure and provides support to the tissue and many more parts of the cell.

3.      How does salt affect the cells shape? And the stomes?

• Salt wrinkle cells and stomes (turgency)