wednesday, oct 12 objective: differentiate between types of cells br:which body system would a sperm...

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



Wednesday, Oct 13

Objective: SI 301 – Understand the tools and methods used in a simple experiment

BR: Describe the function of a nerve cell

Wednesday, Oct 12Last chance to view BR – 1 min



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!

ScenarioDana 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 measurement6. Calculate the initial area of the bread by multiplying the

breads length x width7. 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 100

9. Repeat steps 6-8 for all bread slices10. 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

wednesday, oct 12 objective: differentiate between types of cells br:which body system would a sperm...

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