seventh grade science seed germination: preparing for an experiment
TRANSCRIPT
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Seventh Grade Science
Seed Germination: Preparing for an Experiment
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Introduction
• Purpose
• Keys to Successful Experiments– seed are useful
• abundance
• variety
• low cost
• portability
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Seed Germination
• Focus of the experiment
• Experimental treatments
• Environmental factors
• Terms:– radicle, shoot,
seedling
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Scientific Names
• Name Must be in Latin
• Name Must be a binomialbinomial– 2 parts, genus & species
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Diagram of the Parts of a Seed
• Dry & pre-soaked seed examinations• Label drawing
– common name
– family name
– scientific name
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Take-Home Exercise
• Take home baggies, towels, & seeds
• Record names of seed types
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Construct an Observation Table
• Use space on p.6.
• Observations and Measurements
• Bring baggies with sprouted seeds back to lab next week
Kidney beans, day 2
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Summarizing Data
• Data
• Statistics
• Populations vs. Samples
• quantitative vs. qualitative variables
• error, precision, and bias
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Graphing• Correlation:
• bar graph
(frequency within
categories)
Height (in)
Wei
ght
(lb
) +
Height (in)
Com
fort
in
airl
ine
seat
s -
Figure 1: Percent Grade in Classes
20
40
60
80
Ban
d
Mat
h
Scie
nce
Art
Com
pute
rs
Classes
% G
rade
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Descriptive Statistics
• mean
• population
• sample
• median
• range
• standard deviation
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Presenting Tables
• Rows & columns
• Units must be indicated, e.g., – grams (g)– centimeter (cm)– millimeters (mm)
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Seed Germination Experiment
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Introduction• Physical factors of the environment
– Climate– Soil– Stimulants– Inhibitors
• Biotic vs. Abiotic• Competition• Allelopathy
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The pH Scale
• neutral
• acidic
• basic or alkaline
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pH ExampleACID
BASENEUTRAL
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Example Using pH
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Fire Exposure Example
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CONTROL TREATMENT 1
TREATMENT 2 TREATMENT 3
Fire Exposure Example
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Supplies and Equipment
• Provided:– ziploc baggies, paper
towels, and seeds
• Not Provided:– inexpensive common
household items needed to carry out the experiment
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Designing an Experiment
• problem
• hypothesis
• procedure
• prediction
• construct data table
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Check it Out (p.7.)
• I will check your experimental design
• Begin experiment after you get the “OK”
• Conduct experiment for ONE WEEK
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Writing up Your Experiment
• Must Have a Formal Lab Report Write-up which includes– Observations
• table
• graph
– Discussion