Welcome!
Quiz today and lab –
Remind your partner:
how do you find the
independent,
dependent and control
variables?
A number of studies indicate that if people
eat a diet that is low in fat, then their
chance of getting colon cancer will be
decreased.
Lab work
Test the soil: Extraction and
Nitrogen tests
Do it THREE times –
 legume,
non-legume,
soil with no seeds.
Nitrogen Lab
 Purpose: Can nitrogen fixation be measured in soil
containing growing legumes?
A scientific method for this class
 Observations
 Pose a Question = Purpose Question
 Hypothesis (use If/then format)
 Gather Data (design and run the experiment)
 Analyze data (was the hypothesis right or wrong)
 Communicate (written or verbal)
Observation: When you put cut flowers in
water, adding a teaspoonful of sugar to the
water will make the flowers last longer.
Doctors have discovered that when
maggots are placed on infected
wounds the wounds heal faster.
Purpose: Can nitrogen fixation be measured
in soil containing growing legumes?
Quiz tomorrow!
 Experimental design:
 Identify independent/dependent variables
 List constant variables
 Identify control and experimental groups
 Write a hypothesis using the if/then format
 Retakes for food web quizzes too!