Ganong potometer exp.

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Plz help me out with the dam bloody ganong's potometer experement?????????

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A potometer is a device used for measuring the rate of water uptake of a leafy shoot. The reasons for water uptake are for photosynthesis and transpiration.

# A bubble is introduced to the capillary; as water is taken up by the plant, the bubble moves. By marking regular gradations on the tube, it is possible to measure water uptake.
# A reservoir. Typically a funnel with a tap; turning the tap on the reservoir resets the bubble. Some designs use a syringe instead.
# A tube for holding the shoot. The shoot must be held in contact with the water; additionally, the surface of the water should not be exposed to the air. Otherwise, evaporation will interfere with measurements.

Preparation

1. Cut a leafy shoot from a plant and plunge its base into water. This prevents the xylem from taking up any air. Wetting the leaves themselves will alter the rate of transpiration.
2. Immerse the whole of the potometer into the sink. Move it about until all the air bubbles come out.
3. Recut the shoot's stem underwater. Put it into the bung; grease the bung with plenty of petroleum jelly (Vaseline) if it doesn't stay and then put the bung into the potometer.
4. Make sure the tap is closed, then lift the whole assembly out of the water.
5. Leave the end of the capillary tube out of the water until an air bubble forms then put the end into a beaker of water.

Types of Potometer

1. Ganong's Potometer
2. Darwin's Potometer

Precautions

1. When you cut a twig from a plant immediately put it under water (only the cut portion). And then cut a small part under water. This prevents entry of air into the xylem vessels
2. Never change the conditions of the potometer as outside conditions determine water uptake.

source
http://www.relan.net/How-to/Potometer.html
wiki

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hey! are u taking help frm some book or something ???
I mean ,what an illstration!!!!!!

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source
http://www.relan.net/How-to/Potometer.html
Very Happy

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Oooooh!!!ok...