Photosynthesis and Respiration: Formula Scramble (page 2)
Autotrophs, such as plants, produce organic compounds (like glucose) through the process of photosynthesis, in which light and carbon dioxide combine to make glucose and release oxygen. Respiration is the opposite process in which living organisms use oxygen to break down organic molecules (like glucose) to produce energy needed for survival and release carbon dioxide and water. This activity will allow you to construct the chemical formula for these two processes.
An envelope containing the following words and symbols on individual pieces of paper:
- Empty the envelope of words and symbols on the desk.
- Begin by combining pieces to form the word equation for photosynthesis.
- Underneath this equation use the remaining words to form the equation for respiration.
- If you did it correctly, you will not have any leftover pieces of paper. If you do, reexamine your equations to find your error.
- Write the word equation for photosynthesis. Write the word equation for respiration.
- How do plants and animals depend on each other for survival?
- They both produce products that the other needs for survival.
Respiration produces carbon dioxide gas. One way you can verify the production of carbon dioxide in your own respiration is by blowing into a container of bromthymol blue solution (prepared by the teacher; see Teacher's Notes). Use a straw to bubble air into a large test tube partially filled with bromthymol blue. What happens to the color? If it changes to yellow, this is evidence of the addition of carbon dioxide. If you want to see it change back to blue, put a radish seedling in the yellow chemical, stopper it, put it in the sun, and leave it twenty-four hours. What do you think will happen?
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