Wednesday, Oct 12 Objective: Differentiate between types of cells BR:Which body system would a sperm cell belong to? (look at word wall if you don’t remember the 11 body systems!)

Wednesday, Oct 12 Objective: Differentiate between types of cells BR:Which body system would a sperm cell belong to? (look at word wall if you don’t remember the 11 body systems!)

4 MINUTES REMAINING…

Wednesday, Oct 12 Objective: Differentiate between types of cells BR:Which body system would a sperm cell belong to? (look at word wall if you don’t remember the 11 body systems!)

3 MINUTES REMAINING…

Wednesday, Oct 13 Objective : SI 301 – Understand the tools and methods used in a simple experiment BR:Describe the function of a nerve cell

2 MINUTES REMAINING…

Wednesday, Oct 12 Last chance to view BR – 1 min Objective: Differentiate between types of cells BR:Which body system would a sperm cell belong to? (look at word wall if you don’t remember the 11 body systems!)

30 Seconds Remaining…

10 Seconds Remaining…

Time’s up! Put Bell Ringer in Folder Today’s Agenda: Review Cell Notes Science Fair SI 301

Reminder Quiz on Friday – Cell Notes (yesterday’s wkst) – SI 304 (today’s notes) HW will be given out today – due Friday at start of class!

Red Blood Cells Red disks with dented center Carries oxygen to rest of body No nucleus Made in bone marrow Cardiovascular, Respiratory & Skeletal system

Epithelial Cells Densely packed sheets Covers and lines body surfaces (external & internal) Integumentary

Smooth Muscle Cell Elongated cell Allows organs to move (like the stomach when it is digesting food) Involuntary motion Muscular & Digestive systems

White Blood cell Round cell with extensions Kills viruses and bacteria Extends pseudopods (arms) to crawl through tissue and fight infection Lymphatic & Cardiovascular systems

Nerve Cell Long branching cell with three components Receives biochemical messages and transmits them so that body can perform physical, mental and emotional functions Nervous System

Sperm Cell Oval head and thread-like tail Built for swimming Fertilizes female egg which will develop into a fetus Reproductive System

It’s time for the dreaded… SCIENCE FAIR!

Scenario Dana notices that her recently bought bread has been getting moldy within a week. She leaves it out in her kitchen and wonders if temperature affects the bread molding Testable Question: Does temperature affect the time it takes bread to mold?

Background research/info Bread mold has been seen to grow at room temperature (70 degrees). Temperature effects the growth of bread mold. Wonder Bread is left to sit at different temperatures until mold is seen. The bread is kept at 40 degrees, 70 degrees, & 86 degrees.

Variables Independent Variable = What I change – Temperature (40, 70 & 86 degrees) Dependent Variable = What is being measured – The amount of mold

40 Degrees 70 Degrees (Room temperature) 86 Degrees

Hypothesis an “if, then” statement based on the IV and DV A prediction Does NOT have to be correct “If I change the temperature of the bread to something colder than room temperature, then there will be less mold”

Control Group The group that does not receive the IV or is not altered Used to make sure the IV is really causing a change in the DV Control Group = room temperature

40 Degrees 70 Degrees (Room temperature) 86 Degrees The room temperature bread is considered the control because we know that it gets moldy in one week. We are using this knowledge to compare our results of the experiment

Constants Things that are kept the same in each group during the experiment # of slices of bread in each temperature setting How bread is kept (left open on plate, kept in bag) Way of measuring mold (ruler, calculating surface area, time it takes to see mold)

Procedure & Materials Procedure = Detailed list of steps explaining how to conduct experiment Materials = a list of materials you will need to conduct your experiment

Procedure 1.Place one slice of bread on one plastic plate. Repeat 8 times so that you have 9 slices of bread total 2.Place three slices of bread in the 40 degree temperature setting 3.Place three slices of bread in the 70 degree, room temperature setting 4.Place three slices of bread in the 86 degree temperature setting

Procedure (continued) 5.After one week, take all slices from their temperature settings and place in room temperature setting for measurement 6.Calculate the initial area of the bread by multiplying the breads length x width 7.Approximate the area of mold growing on each slice of bread (measure length x width of spots of mold) and record in science notebook 8.Calculate percent of bread covered in mold by the equation: (Area of mold/Area of bread) x Repeat steps 6-8 for all bread slices 10.Record data in data table and take averages for each group

Materials Bread – Wonder white bread Plastic plate 40 degree, 70 degree, & 86 degree settings – Refrigerator, kitchen & incubator Ruler Calculator Science notebook

Ms. Levine is trying to determine if fertilizer is going to help her sunflowers grow taller. Testable Question = Does fertilizer help sunflowers grow taller than without fertilizer?

Variables Independent variable = fertilizer Dependent variable = sunflower height

Hypothesis If I apply fertilizer, then the sunflowers will grow taller If I do not apply fertilizer, then the sunflowers will grow taller

Control group Sunflowers without fertilizer

Constants # of sunflowers in each group Amount of water given to sunflowers Amount of sunlight sunflowers receive The way that you measure growth