121 Plus 9 Biology Experiments

An exiting experiment that shows what causes plants to burst when over-watered.Things Required:Rhubarb stalks (found in vegetable department of grocery store)Bowl of water Directions:Place the rhubarb stalks in the bowl of water. Leave the stalks undisturbed for one day.Observe the shape of the stalks after being in the water.This Is What Happens:The ends of the […]

Besides sprinkling on too much salt, what makes food taste too salty?Things Required:SaltWater2 potsDirections:Add two tablespoonfuls of salt to two cups of water. Stir and pour half into one pot and half into the other.Boil the water in the first pot for 20 minutes. Boil the water in the second pot for 10 minutes. Let

The purpose of this experiment is to demonstrate how the change in turgor pressure causes plant stems to wilt.Things Required:1 drinking glassWilted stalk of celeryBlue food colouringDirections:Ask an adult to cut a slice from the bottom of a wilted celery stalk. Put enough food colouring into a glass half full of water to turn it

Here is one easy way through which the body keeps us from getting too high a concentration of salt. Things Required:A salt pretzel or several potato chipsDirections:Eat a salt pretzel or three or four salted potato chips.This Is What Happens:You will need to take a drink of water!Science Behind It:You need extra water to dilute

Purpose : to observe the effect of osmosis on a raisinThings Required:Glass of water10 to 12 raisinsDirections:Place the raisins in the glass of water. Allow them to stand overnight. This Is What Happens:The raisins swell, become fluffy and smooth.Science Behind It:During osmosis, water moves from a greater concentration through a membrane to an area of

Believe it or not, the temperature of food affects the taste. Find out in this experiment.Things Required:Glass of cold water with 1/2 teaspoonful of saltGlass of cold water with 1/2 teaspoonful of sugarGlass of cold water with the juice of half a lemonA food thermometer (optional) Directions:Taste the cold salty water. Let it stand on

Purpose : to demonstrate two critical conditions that influence osmosisThings Required:Table saltPotatoMeasuring cup (250 ml)Measuring spoon-teaspoon (5 ml)Two small bowlsClockDirections:Mix 3 spoons of salt in 1 cup of water. Pour the salt water mixture into one of the small bowls.Pour 1 cup of water into the second bowl. Ask an adult to cut the potato

The smell of food is as important as its taste. In fact, its smell actually influences how it tastes. If you doubt it, try this experiment.Things Required:A small peeled potatoA small peeled apple2 spoonsA graterDirections:Grate part of a peeled potato and put it on a spoon. Grate an equal amount of a peeled apple and

Purpose : to demonstrate diffusion and osmosisThings Required:Eye dropperVanilla extractBalloon, use a small sizeShoeboxDirections:Place 15 drops of vanilla extract inside the deflated balloon. Be careful not to get any of the vanilla on the outside of the balloon. Inflate the balloon to a size that will comfortably fit inside the shoebox and tie the open

There are millions of tiny bumps on the surface and under the tongue that help us experience various tastes.Things Required:Water2 teaspoonfuls of salt2 teaspoonfuls of sugarAspirin2 teaspoonfuls of lemon juice4 cotton swabs or toothpicks with paper towelsPaper towelsPaper and pencil4 small cups or glassesDirections:Place two ounces of water in each cup.To number 1, add two