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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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Introduction

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) 2 Microscope Slides 2 Cover slips Computer (Lab Top) ...read more.

Middle

Put each slide under the microscope -Start with a lower objective then move to the greater objective -Get to 400x -Observe the difference between the two slides 9. Capture both shots on computer Results: Plasmolysed Onion Cell (Hypertonic Solution) 400x Turgid Onion Cell (Hypotonic Solution) 400x Discussion 1. All plant cells have a cell wall of cellulose and a semi permeable cell membrane. Which of these is able to change shape? The cell wall has a rigid shape. From the observations made, the semi permeable cell membrane changes shape while the rigid cell wall maintains its shape. ...read more.

Conclusion

Osmosis occur between the outside and inside of the cell, when salt solution surrounds a cell, area with the higher concentration of water molecules (inside of cell) diffuses to the outside with lower concentration of free water molecules (outside of cell) 4. Why should we be careful when applying fertilizer to plants in the school grounds? Why must gardeners follow dilute instruction? If the fertilizer has a higher salt concentration then the plant itself, concentration of water inside the cells of the plant would increase. Osmosis occurs when there is a concentration gradient. When an inaccurate fertilizer is added, water would leave the plant from a high concentration area to a lower concentration area. The plant will eventually die because of the shortage of water. ...read more.

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4 star(s)

Response to the question

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 ...

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Response to the question

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.

Level of analysis

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.

Quality of writing

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


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Reviewed by skatealexia 26/07/2012

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