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Photosynthesis & Stomata

Cscope 7th Grade 2012-2012 Unit 2 Lesson 1

Katie LeDoux

on 9 September 2013

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Transcript of Photosynthesis & Stomata

Photosynthesis & Stomata
Unit 2 Lession 1
Did anyone see structures that looked like these?
Group of 3:
each person has a different leaf
paint at least 1 square centimeter of the underside of the leaf with clear nail polish
let it dry completely
Always start AND finish on the lowest magnification
Carry the microscope by neck and base with both hands
Do NOT turn random knobs

Microscope Use
place clear tape on each dried nail polish patch
GENTLY peel the nail polish from the leaf by pulling on the corner of the tape
place the taped nail polish to a clean microscope slide (remove excess tape)
examine the leaf impression under the microscope working from the lowest to the highest magnification
Look for areas without dirt, thumb prints, damaged areas, or large leaf veins
Draw the leaf surface and any structures for all three leaves in your notebook
Directions (Continued)
Special pores
allow passage of gases (water vapor)
surrounded by guard cells
usually on underside of leaves (lower epidermis)
# of stomata determined by climate
high concentration of stomata = fast growth, wet climate
low concentration of stomata = slow growth, dry climate
site where carbon dioxide is taken into the plant & oxygen & water vapor is released in photosynthesis
Jellybean shaped cells
surround stomata
Expand to open (lets water out)
Contract to close (keeps water in) when dehydrated
What were the other components that are necessary for photosynthesis?
light (energy) &
chlorophyll (found in chloroplasts)
Draw the basic steps of photosynthesis. Also include where the majority of stomata are located (not show on this picture)
Label the microscope handout then glue into your notebook
Light Source



Fine Adjustment Knob

Coarse Adjustment Knob

Stage Clips


Objective Lens


Revolving Nosepiece

Body Tube

Eyepiece (Ocular Lens)

Place the slide on the microscope
Use stage clips to hold slide in place
Start with the lowest setting
Look into the eyepiece
Use the coarse adjustment knob to find the object
Use the fine adjustment knob to focus it

Move the nosepiece to the medium objective
Make sure objective does NOT touch slide
Do NOT use the coarse adjustment knob!
Use the fine adjustment knob only!
If you don’t see anything, go back to low power and try again until you see the object

Move the nosepiece to the high objective
Make sure objective does NOT touch slide
Do NOT use the coarse adjustment knob!
Use the fine adjustment knob only!
When done, change to the lowest magnification
Full transcript