Fatin Nasuha Binti ZamriD20101037513

Wan Nor Izzati Binti Wan Mohamad DinD20101037530

Yantie Binti MaklinD20101037471

Group members

OSMOTIC PROPERTIES OF SWIM BLADDER

To investigate the osmotic properties of swim bladder using

data logger.

OBJECTIVE

Fish is the one of aquatic life. it can swim to the deep and shallow level of water. What is the ability of the fish that affect it to swim in the water? Explain.

ENGAGE

I need stability to swim

Hypothesis 1• Is swimming bladder is selectively permeable

then it will demonstrate osmotic properties

Experiment procedure 1 1. A fresh swim bladder is used to construct an

osmometer (see photograph below). 2. The bladder is filled with sucrose solution and

placed in a beaker of distilled water. 3. Pressure sensor is used to measure the pressure

change inside the swim bladder.

EMPOWER Planning and doing your

experiment

The set up of experiment

Data logger

Pressure sensor

Swim bladder

EMPOWER(RESULT)

The results of the try out experiment

Duration (min) 26

Initial pressure (kPa)

Final Pressure (kPa)

Pressure change (kPa)

Set up A 0.273 1.323 +1.05

Set up B 0.205 0.85 +0.65

Hypothesis 2 If the tissue of swim bladder is “killed” by boiling,

then the membrane will cease to be selectively permeable, and osmosis will not occur.

Experiment procedure A fresh swim bladder is boiled until it appears

well done. The boiled swim bladder is used to construct an

osmometer as before. The bladder is filled with sucrose solution and

placed in a beaker of distilled water. Pressure sensor is used to measure the pressure

change inside the swim bladder.

The results of the boiled swim bladder

Duration 1 hr 33 min

Initial pressure (kPa)

Final pressure (kPa)

Pressure change (kPa)

0.742 -0.068 -0.81

Hypothesis 3 If the tissue of swim bladder is “killed” by freezing

and drying, then the membrane will cease to be selectively permeable, osmosis will not occur.

Experiment procedure A fresh swim bladder was hung in ambient air and

allowed to dry for days (see below). Another fresh swim bladder is left frozen overnight, in

the freezer compartment of a domestic refrigerator. Both swim bladders were soaked in tap water at room

temperature for 20 minutes. Osmometers are constructed with the swim bladders. The bladder is filled with sucrose solution and placed

in a beaker of distilled water. Pressure sensor is used to measure the pressure

change inside the swim bladder.

Photo of dried swim bladders

Result of dried swim

bladder

Result of frozen swim

bladder

Duration 3hr 15 min

Initial pressure (kPa)

Final Pressure (kPa)

Pressure change (kPa)

Dried Swim Bladder

-0.039 2.793 2.832

Frozen swim bladder

0.142 4.224 4.082

1. What happen to the swim bladder in the water?2. What does the relationship between selectively

permeable of swim bladder and the change of pressure in the experiment?

3. What is the effect of high and low temperature to the osmotic pressure in the swim bladder?

4. Does the high temperature affect the tissue of the swim bladder?

5. Does the tissues of swim bladder is affected by freezing and dried condition?

6. What are the osmotic properties of swim bladder

EMPOWER(DISCUSSION)

ENHANCE

Have you ever seen this phenomenon before?Why does the fish unable to swim properly in order

to rise to the top of the water.

THE ENDThank you