how-plants-get-food

how-plants-get-food - How Plants Get Their Food(1 2 How do...

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How Plants Get Their Food (1)
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How do plants get their food ? The soil was watered but nothing else was added. After 5 years, the tree had gained 74kg in weight but the soil had lost only 52g. van Helmont concluded that the tree had made 74kg of new growth from water alone 2 90.72kg soil In the 17th Century, A Belgian physician, van Helmont, set up an experiment in which he planted a willow sapling in a weighed amount of soil. 90.20kg soil
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van Helmont’s experiment was effective in showing that the plant’s food did not come from the soil. But he had overlooked the fact that air was available to the plant as well as water . Could it be that the plant made 74kg of material from just air and water ? This might seem unlikely but we now know that plants do indeed make their food from carbon dioxide from the air and water from the soil. 3
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Feeding Animals get their food by eating plants, or other animals Carnivores eat animals Herbivores eat plants Plants make their own food They combine carbon dioxide from the air with water and dissolved salts from the soil Plants do NOT get their food from the soil The first stage by which plants make food is called PHOTOSYNTHESIS 4
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Animals get their food … by eating plants or . .. ... plant products, or (c) other animals Plants make their food by photosynthesis 5
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Photosynthesis 6 Green plants take in carbon dioxide (CO 2 ) from the air They take up water (H 2 O) from the soil The plants combine the CO 2 with the H 2 O to make the sugar, glucose (C 6 H 12 O 6 ) 6CO 2 + 6H 2 O = C 6 H 12 O 6 + 6O 2 Oxygen (O 2 ) is a by-product of this reaction
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C 6 H 12 O 6 CO 2 CO 2 CO
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.

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how-plants-get-food - How Plants Get Their Food(1 2 How do...

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