Lab 4: Plants and Energy
Materials
- Parts I, II and III:
- Prepared extracts
- Apparatus
- Leaves
- Potato, sweet potato, yam, rudebaga, apple and pear
- Microscope
- Slides
Exercises
- Main Idea:
- Investigate different aspects of the photosynthesis reaction
- Part I: Chromatography
- Measure distances traveled by the different pigments
- Fill in the table with results
- Part II: Observe Plant Slides
- Make a drawing of the plant slides that were made
- Using arrows, show movement of gases in and out of plant
- Part III: Energy Storage in Plants
- Observe how glucose or chemical energy is stored in plants
Lab 3: Diffusion and Osmosis
Materials
- Part I: Brownian Movement
- Suspended charcoal solution/India ink particles to represent large molecules
- Part II: Diffusion of Molecules in Various States
- Perfume
- Timer for measuring how many seconds it takes for perfume to travel
- Ruler for measuring how far perfume travels in feet
- Agar plate for boring holes
- Agar
- IKI for agar plate
- Methylene blue for agar plate
- Part IIIA: Role of Membranes in Diffusion
- Thistle tube apparatus for observing diffusion
- Different concentrations of water using salt
- Dialysis tubes
- Part IIIB: Effects of Temperature on Diffusion
- Dialysis tubes
- Hot water bath
- Cold water bath
- Bags
- Pen for labeling
- Weight measurer
Exercises
- Part I: Brownian Movement
- Discuss questions such as:
- "Are molecules constantly moving?"
- "How can we determine whether they are moving or staying still?"
- Use suspended charcoal solution to represent large molecules
- Observe movement of molecules under microscope
- Part II: Diffusion of Molecules in Various States
- Observe diffusion of gas within a gas
- Measure (in seconds) how long it takes perfume to travel in the atmosphere of the room (in feet)
- Calculate to mph
- Test how long it takes for observer to smell perfume from across the room
- Observe diffusion of a liquid in a solid
- Put two holes in agar plate
- Drop IKI in one hole, and Methylene blue into the other
- Let liquids dissolve into agar until end of lab period
- Compare distances traveled into agar by each liquid
- Part IIIA: Role of Membranes in Diffusion
- Subject living cells to different concentrations of water
- Examine the results not he turgor pressure inside the cell
- Part IIIB: Effects of Temperature on Diffusion
- Set up dialysis tubes in hot water and cold water bath at each table
- Label
Lab 2: The Microscope and a Forensic Experiment
Materials
- Compound light microscope
- Stereomicroscope (dissecting scope)
- Example slides
Exercises
- Practice using microscopes with sample slides and materials
- Compare the powers of both microscopes to determine which one to use in each experiment
- Solve a crime by examining evidence from the 'crime scene'.
- Compare the evidence from the suspects using the light microscope
