Super scientists tests the toxicity of water using radish seed bioassays. Over the course of five days, scholars observe the germination process of several radish seeds, looking closely at their roots to determine the level of toxins present in a water sample.  

Concepts

pollution, toxic chemicals, toxicity, water runoff, germination, seed germination, making observations, observational skills

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Additional Tags

science

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Instructional Ideas

• Create and pose reflection questions on a classroom blog; direct pupils to reply to each question and to at least one peer 
• If materials or time do not permit individual activities, conduct the activity as a class, inviting class members to help with different steps
• Staple several sheets of paper together or use a composition notebook for learners to draw and write their daily observations 

Classroom Considerations

• Review materials before implementing the activity in the classroom
• Requires adult supervision; invite parents and guardians to lend a helping hand 
• The resource is intended for the home, but also works well in the classroom 

Pros

• Breaks the activity into eight easy-to-follow steps 
• Offers two extension activities 
• Gives background information about bioassays

Cons

• None