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zophra

teacher - need advice

Zophra
11 years ago

Hi.

I'm a high school Biology teacher and I'm thinking ahead to this coming school year's labs. I'd like to do a lab to show "response to stimuli" for plants (which many students have told me that "they're not alive... they don't move...) (sigh.)I have done this demonstration with my own kids at home where you take a seed and sandwich it between a clear soda bottle and black paper. Fill the bottom of the bottle with water so the paper wicks up the water and ...the seed germinates, roots emerge,etc. all very visible against the black paper. Then... we flip the bottle and the poor seedling exhibits geotrophism - the roots curl around trying to grow toward gravity the stem curls to the new "up" etc.

With this experiment in mind for say 50 lab groups... what are seeds that: 1. are cheap 2. are easy to see 3. have really good germination rates? (We'll put in two just in case.)

I would appreciate any advice.

Thank you very much,

Zophra

(Tamara)

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