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Specify the location where the test plants were collected.
Drag the marker to indicate the location. Remember, you can zoom into the map for a more precise location.
Date of study
What kind of plant you have chosen for the experiment?
Plant name Specify the name of the plant. If this plant is already in the list of answers, select it using the tooltip.
Photograph of the Plant(s) Place here one to five photographs of a particular plant you have chosen for the experiment. It is desirable that the photo captures specific characteristics of the plant (leaf’s size and shape, shoots, flowers) and those parts of the plants that were used to extract the cell sap.
Please upload from 1 to 5 pictures
What part of the plant did you use in the experiment? Specify which part of the plant you have used to obtained the cell sap or a which part of the plant you used EITHER chopped in small pieces, [coarse??], and suspended in water.
What method did you use to extract the cell sap from your plant? If you checked how the color of the juice varied by the acidity of the medium, specify how you got the juice of the plant.
This question is optional.
Photo of the test sample
Description of the test sample Describe how how the color of the juice has changed in acidic and alkaline media. If you do not see the changes, it also should be noted in the description.
1. Prepare acidic and alkaline solutions. You will need baking soda and citric acid, both available in a grocery store. It is better to make the solutions in small containers (e. g., baby food jars or medicine containers). To prepare a acidic solution, add one teaspoon of citric acid to 50 ml of cold boiled water. To prepare an alkaline solution, add one teaspoon of baking soda to a clean container and add 50 ml of boiling water; you will observe foaming during that process. The container must be labelled with waterproof markers or sticky labels “citric acid solution”, “baking soda solution”. For better preservation, the containers must be tightly closed.
2. Choose the plants for your investigation. You can choose as many plants as you like (ideally at least five.) Later you will fill in a Project Report for each of them.
Give preference to the plants that are specific for your region such as local berries, herbs, trees or shrubs. However, it is not a problem if you would like to use more easily available plants such as agricultural or house plants.
If you cannot decide about a plant to test, perform the first experiment with some commonly used plants. You can make teas (brew it) of it and/or prepare juice from the root.
3.Take a photo of the plant and those parts you are going to use for the extraction of the intracellular fluid. Try to take a photo in a way that the plant is clearly recognizable, i.e. display its parts: flowers or fruits (if available), leaves, and stems.
4. For the experiment, it is necessary to extract intracellular fluid from the plant. Try not to repeat already conducted work.
If you investigate the succulent parts of the plant (fruits, thick leaves, root-crops), you can simply squeeze the juice from them. In some cases, it will be necessary to grate them, or to grind with a blender, or simply to cut into small pieces. If the juice contains some plant tissue debris, it has to be filtered through a fine sieve, gauze, or a dense white fabric. If the colour of the juice is too intensive, it can be dissolved with some boiled water.
If you want to extract the substances from dry plants or their hard and leathery parts (leaves, stems), you can prepare an infusion or a decoction. To make them, the relevant parts of plants must be chopped and covered with hot water (for infusion), or cooked for a few minutes (for decoction) at the boiling temperature, until the colour of the liquid is sufficiently intensive.
Using leaves, stems, or flowers, one can make a tincture. You will need ethanol: spirituous solutions of boric or salicylic acids can be purchased at the drugstore and are suitable for this purpose. Put the chopped parts of the plants into a small tin, add ethanol, and close the tin tightly to prevent evaporation of the ethanol. The tincture will be ready in 1-3 days.
The petals can be used without a preliminary preparation. Put them into a blister and try to grind, e.g. with a back side of a plastic pen or a pencil.
5 ml of solution, decoction, infusion or tincture is enough for the analysis; therefore, you should not use too much of the vegetable material: 2-3 berries, 1-2 flowers or leaves, a few grams of fruit or root etc. will be enough. The prepared sample of intracellular juice must be used for the experiment immediately or stored in a closed container in the refrigerator for no longer than 2 days.
5. Fill three wells of the blister each with 1 ml of the solution for investigation. Then add to the first well 1 ml of citric acid solution (Ac), to the second well – 1 ml of the distilled water (N), to the thirdwell – 1 ml of bakingsoda solution (Alk).
6. In 5-10 minutes, assess the result and take a photo of the blister on a white background. The wells must be labelled according to the character of the medium: Ac (acid), N (neutral), Alk (alkaline). Please notice: if the colour/color of the intracellular fluid did not change, this is not necessarily a failure! This is also a result which must be documented in the project, so that the other participants do not repeat the experiment with this plant.
7. Fill in the Project Report for each investigated plant.
8. Follow the progress of the project, and take part in the discussion of the results obtained by other participants.
Be careful during the work with acidic and alkaline solutions, as well as with the tinctures: avoid their contact with skin, eyes, mouth and nose. If you feel a burning sensation (A SIGN OF ACID) or feel your hands soapy, (A SIGN OF A BASE), wash them with a large amount of water; soap can be used afterwards. In case of contact with the inside of the nose, wash the area with cold boiled water.
Be careful, also, during the work with hot and boiling water. Work only with cooled solutions. If you are not sure that you can prepare an infusion or a decoction yourself, ask an older person to help you.