What it shows
Chlorophyll absorbs red and blue light strongly and reflects most green light, so seedlings under green filters usually grow more weakly than those in white light.
This idea has a short entry only. For the science behind it, read the sentence above with your textbook and ask your teacher to explain the law or idea it shows, so you can describe it in your own words.
Materials
- Six small pots of the same seedlings
- Red, blue, green and clear cellophane
- Boxes or frames to cover each pot
- A ruler and a notebook
Safety
This project uses safe, everyday materials. Still, read the rules below with a parent before you start.
Never use mains electricity: power models with cells, batteries or a low-voltage adapter. Sharp and hot tools, flames and lab chemicals need an adult or your teacher beside you. Keep magnets, button cells and small parts away from young children, and wash your hands after making.
All the safety rulesHow to go about it
Numbered steps have not been written for this idea yet. Plan it with your teacher: sketch the design with measurements, build one part at a time, test each part, and write every observation with the date. The free ebooks below have step-by-step projects of the same kind.
Take it further
Keep everything else the same (water, soil, temperature) so the test is fair.
Change one thing, measure what happens, and add a table or chart of your readings: that is what turns a model into your own investigation.
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