The purpose of this lab is to observe the effects of different osmosis (hypertonic, hypotonic) on a living plant cells through a microscope.

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Lab Group Members: Pooja Hattangdi and Carmen Chong     Name: Tiffany Sun

Period 7               Mrs Mulligan            

Sept 29th 2009

Lab 5.2 Water Balance in Living Plant Cells

Purpose: The purpose of this lab is to observe the effects of different osmosis (hypertonic, hypotonic) on a living plant cells through a microscope.

Materials:

15% NaCl Solution (Salt Solution)

Distilled Water (dropper)

1 small piece of  an Onion

Cutter ( to get only the skin (epidermis)of the onion)

Microscope (also cord to connect to computer)

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2 Microscope Slides

2 Cover slips

Computer (Lab Top)

Paper Towel

Forceps (Tweezers)

Procedure (Method): 

  1. Cut the onion
  2. Break off a small chunk of onion
  3. Break and peel of a small piece of onion skin
  4. Use ‘cutter’ to cut of that small piece of skin
  5. For hypotonic:  Flood cells with NaCl solution

For hypertonic: Flood cells with Distilled Water

  1. Cover each microscope slides with cover slips
  2. Use paper towel to draw the water and salt solution
  3. Put each slide under the microscope

-Start with a lower objective then move to the greater objective

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Minor grammatical errors in places. Punctuation missing in the method list. Otherwise, punctuation, grammar and spelling all fine. Layout is clear with good subheadings.

The materials and purpose of the experiment are clearly listed. An interesting way to carry out this experiment. Method clearly explained. The diagrams provided are accurate and explained well by being accompanied by further diagrams. The discussion answers a series of questions which shows good scientific understanding of the experiment and the principles behind osmosis.

Created as a group experiment. Response to the question is done well. The candidate lays out the experiment well with clear pictures and sections that show good scientific understanding behind the experiment. To improve, an evaluation should have been provided discussing factors which may have confounded their experiment and how to improve it because this shows understanding on how to refine and make experiments a lot more reliable with their results.