I am putting the finishing touches on my 7th/8th grade book Science in the Atomic Age (which should be available for purchase in June), and I wanted to post another excerpt from the book. The excerpt I posted previously comes from a section about the brain. This one comes from an earlier chapter, where I discuss plants.
By the time the students reach this point in the course, they know that producers are organisms which make their own food (usually through photosynthesis), and consumers must eat other organisms for food. They also know how to interpret chemical equations and the specific chemical equation for photosynthesis. In addition, I have just shown them the chemical equation for the process by which consumers burn their food for energy and have pointed out that it is the opposite of the chemical equation for photosynthesis. Here is the discussion that follows:
In other words, producers like plants use water and carbon dioxide to make glucose and oxygen, and consumers then use that glucose and oxygen to make carbon dioxide and water. So producers are feeding us, and we take what the producers make and then produce the chemicals they need to make what we need! In this sense, at least, consumers are the opposites of producers.
This is a real testimony to God’s power and ingenuity. He not only created the producers to feed the consumers, He also designed the consumers so that when they use what the producers made, they give the producers what is needed so that the producers can make more food. Now, of course, the sun plays its role, too. It provides the energy the producers need in order to do photosynthesis in the first place.
This is all summed up in the illustration above. The sun shines light on the earth. Producers absorb that light in the chloroplasts of their cells and use it, along with carbon dioxide and water, to make glucose and oxygen. Consumers then take that glucose and oxygen and use them to make energy for themselves. This ends up making carbon dioxide and water, which can be used by the chloroplasts in the producers (along with more energy from the sun) to make more glucose and oxygen. As a result, the only constant input needed is energy from the sun. Everything else just keeps getting recycled between producers and consumers!
The balance between producers and consumers, as illustrated in the drawing above, is amazing. However, we need to be aware that it is often oversimplified. I have heard many educators say, “Plants make food and oxygen, while animals use food and oxygen.” That is true, but it is oversimplified. Plants do make food and oxygen. It happens when they are doing photosynthesis. However, they also use food and oxygen.
Does that statement surprise you? It might, but if you think about it, the statement makes a lot of sense. After all, why are plants doing photosynthesis? Because they need to make food for themselves, right? Well, what does the plant do with that food? It burns that food for energy, according to the equation I showed you earlier. What does that equation say? It says oxygen and C6H12O6 are reactants. That means they are used up. So plants not only use carbon dioxide and water to make glucose and oxygen, but when it is time for them to burn their food, they must use glucose and oxygen to make carbon dioxide and water.
Now wait a minute. If plants end up using the glucose and oxygen they make through photosynthesis, how are we able to use it? Because of this important fact: Plants make a lot more food and oxygen than they ever need. If plants only made the food that they need, they would end up using it and all the oxygen they made, and there would be nothing for consumers to eat or breathe. However, plants have been designed to make much more food than they will ever need. That means they also make more oxygen than they will ever use. That way, there is food and oxygen for consumers.
This is a very, very important design feature that many people don’t appreciate. In order for us (and most consumers) to survive, it’s not enough that producers like plants exist. They must not only exist, but they must do a lot more work than just keeping themselves alive. They must overproduce food and oxygen so that there is plenty for the consumers. Thus, the proper way to describe the balance between plants and animals is, “Plants make food and oxygen, but they also use it. However, they make more food and oxygen than they need, so that animals can use the rest.”
7 thoughts on “Another excerpt from Science in the Atomic Age”
To what extent can producers live without consumers? Doesnt an evolutionary paradigm suggest terrestrial plants existed for millennia before the first insect walked? I’m probably missing something. Just throwing out a thought before my cup of coffee has had a chance to work… Which is probably a bad idea.
The evolutionary paradigm says that photsynthetic bacteria were the first producers to form, and most likely, they were the first real organisms. They could have lasted a long, long time without consumers, since they probably weren’t very efficient at first and therefore couldn’t reach levels in which they would overpopulate the area. By the time they evolved to be really efficient, consumers would have needed to evolve as well, to keep them in check. It’s possible that some of the first consumers were only “part-time” consumers, like the Euglena, which can make its own food and injest food as well. The “part-time” consumers could have given rise to full-time consumers later on.
Most evolutionists that I read would say that land plants did evolve before land animals, but that doesn’t necessarily present a problem. Once again, the first land plants were probably inefficient and not very successful. However, as they got successful, they presented more resources to exploit, so animals that could venture onto land would have a distinct advantage. Thus, land animals probably evolved as land plants became more successful.
Hmmm very interesting. Im was curious how long a plant could survive in an enclosed container so I did a little searching and there is a guy who claims his sealed bottle garden has lived for 40 years.
I’m always telling climate change terrorists, no CO2, no plants. As a greenhouse operator why the must buy CO2, which is manufactured. Why do farmers risk their lives to farm the slopes of volcanoes? More CO2, the stronger, healthier plants are, the more they produce, the richer the taste and abundance. Less CO2 means harsher winters and droughts.
And NASA confirms that the earth is getting greener as a result of increased carbon dioxide.
I remembered your post while listening to this:
Greetings from Brazil!
Hope you and your family are doing well!
Thanks, Darcy! We are doing well. Hope you and yours are, too!
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