Simple yet interesting project in Bio

[chound]

Can anyone suggest ideas for interesting projects in Biology, preferably Botany. There should be some amount of practical work involved in it. It shouldn't go too complex like DNA fingerprinting, etc.

 

[Bystander]

Germination rates as functions of temperature, soil pH, salinity, soil type (sand, humus, clay, etc. content), N P K nutrient addition.