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Others Like “What is the Rate of Leaf Growth Along the Stem?”

Project Idea
Plant stems grow through a process of elongation due to cell divisions within the stem. Does the entire length of the stem elongate evenly? Or do certain regions along the plant stem grow more or less than others? Regions that are involved in active growth are called vegetative. You can conduct an experiment to show which regions of a bean seedling are involved in vegetative growth. Use a marker to mark one inch sections along the main stem of a young bean seedling. Number the regions 1-6… Read more
PlantBio_p023
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Time Required Long (2-4 weeks)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No issues
Project Idea
Chlorophyll is a natural pigment found in green plants. It is the primary pigment that absorbs light energy from the sun for photosynthesis. This energy is then used by the plant to synthesize glucose from carbon dioxide and water. Chlorophyll in the leaves of plants can be extracted and separated using chromatography. A good source of chlorophyll for an extraction is a dark green leafy vegetable like spinach. Rub a fresh spinach leaf on the bottom of a strip of filter paper. You can get a… Read more
PlantBio_p020
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Time Required Average (6-10 days)
Prerequisites None
Material Availability The page on Paper Chromatography Resources lists the best papers and solvents for chromatography. The paper needs to be specially ordered and is available from the Science Buddies Store.
Cost Low ($20 - $50)
Safety The solvents, like acetone or alcohol, for paper chromatography should be used in well-ventilated areas. Adult supervision is recommended.
Project Idea
Leaves use sunlight to make food for the plant. Sunlight contains all of the colors of the rainbow, but are all of those colors used by the leaf? Can you find out if some colors of light are more imporant than others? Read more
PlantBio_p015
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Time Required Average (6-10 days)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No hazards
Project Idea
Soil may look like a bunch of dirt, but good quality soil is actually a complex mixture of dirt, nutrients, microorganisms, insects and worms. What type of benefit do these microorganisms offer a growing plant? You can test this by baking soil in the oven to sterilize and kill the microorganisms. Do plants grown in sterile soil do better than plants in unsterilized soil? What about adding worms to one plant, but not to the other. Will the plant with worms grow better? Some insects are bad… Read more
PlantBio_p031
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Time Required Very Long (1+ months)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety Adult supervision is required when using the oven. Use caution when handling and disposing of mold. Treat molds according to the same safety rules as outlined for bacteria in the Microorganisms Safety Guide.
Project Idea
Germination is the process by which a seed emerges from the seed coat. Many different variables can effect the process of germination. Try to sprout seeds from different species of plant to see if different species vary in germination time. Are weeds faster germinators than vegetables? Try measuring seeds and then germinating them to see if big seeds sprout at a different rate than small seeds. Try sprouting seeds in different environments to test the effect of different environmental… Read more
PlantBio_p028
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Time Required Very Long (1+ months)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety Use caution when using a blade to cut open seeds. Adult supervision is recommended.
Project Idea
During metabolism, organisms experience physical and chemical changes. All animals need some way to exchange chemical waste generated during metabolism for fresh nutrients. One way that these metabolic chemicals are exchanged is during respiration, the process by which used carbon dioxide gas is exchanged with fresh oxygen and circulated throughout the body. How do organisms living underwater respirate? They use gills, which filter oxygen from the water and pass the oxygen into the… Read more
Zoo_p031
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Time Required Average (6-10 days)
Prerequisites None
Material Availability Readily available
Cost Low ($20 - $50)
Safety No issues
Project Idea
Do you like to climb trees? The branches of trees are what make them so fun to climb. Each branch starts out as a tiny shoot that grows out from a stem. How is the growth of shoots along a stem regulated? Read more
PlantBio_p018
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Time Required Long (2-4 weeks)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No hazards
Project Idea
Many organisms have ways of orienting toward or away from an environmental stimulus. Some of these behaviors are instinctive, meaning they are behaviors with built in instructions that do not need to be learned. The instinctive response to a stimulus is called a taxis, and there are several types of cues: electricity (galvanotaxis), gravity (geotaxis), light (phototaxis), heat (thermotaxis), touch (thigmotaxis) or a chemical (chemotaxis). You can design experiments to test whether organisms… Read more
Zoo_p043
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Time Required Average (6-10 days)
Prerequisites None
Material Availability This science project can be done with insects you catch in your own backyard or order from [# ProjectGuide Name="Advanced.ApprovedSuppliers" Value="HtmlAnchor" HtmlText="online vendors" #] such as [# Link Name="Advanced.ApprovedSuppliers.2" Value="HtmlAnchor" HtmlText="Carolina Biological Supply Company" #]
Cost Very Low (under $20)
Safety If you choose to try this science project with small animals (rather than with insects), use caution when handling the animals and always have an adult present. The use of small animals may require [# ProjectGuide Name="Advanced.ScientificReviewCommitteeSRC" Value="HtmlAnchor" HtmlText="SRC approval" #].
Project Idea
Flower development is an important part of plant growth. When a plant has reached maturity, it needs to develop flowers in order to reproduce. The male and female parts of the flower have specialized structures for reproduction that develop as the plant matures. How do flowers develop over time? Which structures develop first? You can answer these questions by dissecting the flowers of a gladiola. Gladiola flowers grow and develop along the stem, whith the most mature flowers opening at the… Read more
PlantBio_p027
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Time Required Average (6-10 days)
Prerequisites None
Material Availability Gladiola plants are available for purchase in many plant nurseries at select times of the year. Check with your local nursery.
Cost Low ($20 - $50)
Safety Use caution when using a blade for flower dissection. Adult supervision is recommended.
Project Idea
Trees grow more during the early spring than they do the rest of the year. Because of this period of dormancy, or lack of growth, each year of growth is marked by a line called a tree ring. You can count the number of rings in the cross section of a tree trunk to show how old the tree is. You can also count the number of rings in a stem to see the age of a stem or branch. One way to measure the rate of growth of a tree is to count the number of rings per inch. Trees with high numbers of… Read more
PlantBio_p025
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Time Required Short (2-5 days)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety No issues
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