Welcome to Biology! Ms Itts Room 613

Syllabus and Lab Safety

Your Assignment: Obtain and bring in your classroom supplies Sign and return the paper stating you and your parent/guardian have read and understand both the syllabus and the lab safety contract These are worth a grade and must ALL be turned in at the same time

DISCUSSION What do you remember about the scientific method?

Scientific Method Refresher What is the effect of compost age (independent variable) on the growth of bean plants (dependent variable)? What is the effect of compost age (independent variable) on the growth of bean plants (dependent variable)? What is the effect of compost age (independent variable) on the growth of bean plants (dependent variable)? Scientific Method Refresher PROCEDURE MUST INCLUDE: Independent Variable The part of the experiment that “I” change Dependent Variable The part of the experiment that is changing due to the independent variable Constants/Control Variables Everything that is kept the same during an experiment Control Group The group that the independent variable is compared to Data Table The data table should include the independent variable and the dependent variable Qualitative Data: DESCRIPTIONS **Quantitative Data: NUMBERS What is the effect of (independent variable) on the (dependent variable)? If (independent variable), then the (dependent variable) will … Make a Graph

Scientific Method Practice Sarah wanted to test the effect of coffee grounds on the growth of tomato plants. She gathered 4 identical tomato plants and placed them into 4 identical pots with 100g of soil in each pot. Sarah added the following amounts of coffee grounds to the pots: Pot 1: 0g; Pot 2: 5g; Pot 3: 10g; Pot 4: 15g. She watered the plants the same amount each day and measured the growth of the plants every day for 30 days. Identify: Dependent Variable, Independent Variable, Constants/Control Variables, Control Group. Write: Question, Hypothesis Construct: Data Table  

Scientific Method Practice Jackie read that Aloe vera promoted healing on burned tissue. She decided to investigate the effect of various amounts of Aloe vera on the regeneration of planaria. She bisected the planaria to obtain 10 parts (5 heads and 5 tails) for each experimental group. She applied concentrations of 0%, 10%, 20%, and 30% Aloe vera to the groups. Fifteen mL of Aloe vera solutions were applied. All planaria were maintained in a growth chamber with identical food, temperature, and humidity. On day 15, Jackie observed the regeneration of the planaria parts and categorized development as full, partial, or none. Identify: Dependent Variable, Independent Variable, Constants/Control Variables, Control Group. Write: Question, Hypothesis Construct: Data Table  

Homework Classroom Supplies Signed Syllabus and Lab Safety Scientific Method Practice