Why don’t herrings swim in a lake and what this has to do with the crunchy carrot? M.Masłowska, M.Poniatowska Collection of experiments showed on POS3 presentation

Transpiration & suck in the leaves Capillary action The roots pump by osmosis

Capillary action

Experiment 1 - traditional Supplies: 2 glass plates, the same size a piece of string white sheet of paper, a little smaller then glass plates a bowl of water and food coloring Procedures: Put a little string on one side of the glass plate, cover this up with the second plate and squize plates with sticking-plaster on two sides. Stick a white sheet of paper to one of the plates (it would be a screen of our experiment) Put food coloring to a bowl of water and stirr. Put the plates to colored water and watch what will be happen with portion of water inside of an instrument.

Experiment 2 Supplies: a piece of chalk a piece of bath sponge a pan of colored water Procedures: Place a dry sponge with the long axis vertical into a pan of colored water. Do the same with a piece of school chalk. Observe as the water moves up.

Experiment 3 Supplies: 1 flower (for ex. carnation) dark blue coloured water dark red coloured water 2 long vases a knife Procedures: Carefully slice the stem in half length ways. Place one half of the stem in dark blue coloured water and the other half of the stem in dark red coloured water. You will soon notice the flower becoming half blue, half red.

Experiment 4 Supplies: a pan of colored water a slat, cut along a wood a good knife or a little saw Procedures: Cut a slat perpendicullary in a half of its length. Put both pieces of wood to coloured water, but one of them upside down. Observe as the water moves up. On one of them heigth of colour should be above the other one. Capillary action is bigger along the natural placed slat then in placed upside down relatively to growing direction.

Supplies: a piece of cotton material (for ex. a wick from a lamp) 2 glasses water Procedures: Drape one end of cotton material in a full glass of water and place the other end in an empty glass. Observe water transport from one glass to the other Experiment 5

Osmosis

Experiment 6 Supplies: a glass tube or pipe a glass container a piece of pork bladder or bowel a rubber sugar coloured water pure water Procedures: Pour sugar to coloured water and stirr well to obtain coloured syrup. Maintain a piece of pork bladder with rubber on one end of glass tube. Place this end of tube in container with pure water. Observe level of dye in the tube. For better results place the tube in a tripod and draw a line in the primary level of coloured syrup on the tube. Use contrast colour marker for that.

Experiment 7 Supplies: 1 cucumber salt a knife a bowl Procedures: Cut several slices of a fresh cucumber, put in a bowl and salt them. After a few minutes cut one more slice of cucumber. Take this fresh slice in one hand and one of salted ones to the other hand

Experiment 8 Supplies: 1 raw egg vinegar water a jar with a lid Procedures: place the raw egg into a jar and cover the egg with the clear vinegar. Top the jar. Bubbles start forming on the surface of the egg shell immediately. It’ll cause the egg shell made of calcium carbonate to disappear. After approximately 24 hour take the egg off the jar. Pour out vinegar and pour in fresh water to the jar. Put the egg without an eggshell into fresh water.

Experiment 9 Supplies: plastic 2-liter bottle (empty) a glass jar with lid sand dry beans water Procedures: Mix 60% (by volume) beans and 40% damp soil. Let the sand absorb all the water. Place the pack mixture into a glass jar tightly (try to get rid of all the air spaces) all the way to the top of the jar. Seal the jar with the lid and place jar inside clear 2-liter pop bottle that has been cut off at the top wide enough to insert the glass jar. The pop bottle acts as a protection shield when the jar breaks. Jar breaks.

Experiment 10 Supplies: carrot 2 containers water salt knife Procedures: Cut several long pieces of carrot. It could has shape of French fries. Fill one container with fresh water and another with salt water. Place several crisp, fresh carrot pieces into each one. Wait at least a half hour (it would be better if longer) then take the vegetables out. Test the flexibility of a carrot that came out of the fresh and salt water.

Torsion forces

A riddle about sunflowers Take a look at these pictures with three different fields of sunflowers.

You can see that all of the flowers are turned toward the same direction – to the Sun. They move after the sunlight all the day. Animals have muscles. Plants for sure don’t have any. How can they move? Answer: They can move because of fitohormone named auxine. It makes cells on one side of the stalk longer and cause the movement of the flower (torsion forces).

The end.