First, a review of class:

First we demonstrated that breathing out produced CO2 gas. How? by blowing through a straw into a solution of water and bromothymol blue.  Here is another way of doing that:




Then we did the famous elodea in a test tube under lights, and observed the oxygen bubbles that were produced.  It looked like this:

As much fun as watching the grass grow.  But with friends and a sunny day, not bad at all.

Hopefully you looked again at the plants after a few hours.  The elodea under the super-bright light got kinda fried, which of course diminished its ability to photosynthesize!  The plants under the cooler overhead projector lights were cooler and still going strong, as were the sprigs in the sun, (I think those were the most efficient.)  The plants which only received indirect light did not bubble very much; less O2 means less photosynthesis.

Doing these two experiments together illustrated the connection between photosynthesis and cellular respiration.

Watch this video to summarize what we have learned about photosynthesis and cellular respiration:

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Next subject: Mitosis: how cells replicate themselves
Prepare by reading Chapter 2: section 3  and answering the questions.
You may also wish to watch the brainpop: http://www.brainpop.com/science/cellularlifeandgenetics/mitosis/
  [pcshome / ilearnathome ]