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Explore the relationship between the independent and dependent variables in this BioTechnology Virtual Lab.
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TODAY IN SCIENCEYOU WILL NEED:
Pencil, colored Pencils Or highlighters
1 sheet of lined paper – set up for Cornell Notes
Update Log #1 - Online
ASSIGNMENT LOG #1
8/25 8/29 Mission Possible -Cooperative project
100/15
8/31 9/2 Tools of the Trade 145
9/1 9/1 Cooperative -Tool ID 15
9/2 9/9
Interactive Reader -Pgs 20-27 - Sidebars, Highlight Answer in text & #1-5 on pg. 27
65
9/6 9/9 BioTechnology Virtual Lab
160
Topic: Biotechnology
What is a European Corn Borer?
NameDatePeriodClass
1.Major Corn Insect Pest2. Female lay up to 600 eggs 4x a
year3.Egg, larva, pupa, moth4. Larvae feed on leaf surfaces,
stalks and bore into midribs
Corn Plant Growth 1.Flowering, fruit-bearing
grass plant2. Seed weight = about .28 g3.10 week growth = 7-10 feet
or (2-3 meters)4. Produce 500 to 1000 seeds
stalk
1 ear of corn
leafroot
tassel
What do Plants need to GROW?
What is their function?
1.Macro and Micro nutrients from the soil
2.CO2
3.Oxygen4.Sunlight
1) Carry out biochemical reaction of photosynthesis – water and CO2 converted into Glucose(C6H12O6) and O2
What is Bt corn and why create it?
1.Bacillus thuringiensis or Bt = soil bacterium -produces crystalline proteins (Cry proteins) are poisons for specific insects
2.Inserted the Cry protein gene into corn plants’ DNA
3.Bt corn is protected by the toxin: larvae eat corn plant and die
Why create Bt corn?
What are the problems?
1.Protect Corn Yield2.More corn to feed the
growing population of humans and animals
1)Harmful to non-target insects (honeybees & butterflies)
2)Humans show allergic reaction to corn when eaten
What is Corn Yield?1.Amount of corn produced
in a field2.The # of kernels on an ear
Corn plant normally produces 1 ear of corn per plant.
Independent and Dependent Variables
Scientists use an experiment to search for cause and effect relationships in nature. In other words, they design an experiment so that changes to one item cause something else to change in a predictable way. These changing qualities are called variables. A variable is any factor, trait or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent and controlled.
The scientist focuses their observations on the dependent variable to see how it responds to the change made to the independent variable. The change of the dependent variable is caused by and depends on the value of the independent variable. Experiments also have controlled variables. Controlled variables are factors that a scientist wants to remain constant (the same), and they must observe them as carefully as the dependent variables. Controlled variables are used to compare the dependent variable’s changes in experiment’s relationship and keep the tests fair.
IDENTIFY INDEPENDENT & DEPENDENT VARIABLES
Pick 2 colored pencils or highlighters
Underline Independent
Circle Dependent