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MEASURING THE STRENGTH OF EMBRYOS How much weight can you lift? Can you lift something that weighs as much as you do? How much weight do you suppose plant embryos could lift? How much weight do you think plants can lift? How can you find out how much weight they can lift? We will weigh some bean seeds, and write it on our papers, then we'll plant them, each at the same depth, in a large, flat box. We have two small boxes that fit nicely into the plant box, and after we weigh a few rocks, we'll put them into one of the boxes. We will weigh some pea seeds (or any other large seed), write down their weight, and plant them, also each at the same depth, in another large, flat box. Then, we will weigh some coins, and, after writing down their weights, we'll put a coin on top of each seed we have planted in the second box. Remember, half-dollars weigh more than quarters, dimes, nickels, and pennies. Do any of the seeds weigh more than the coins? Write it on your lists. What do you think will happen? Every few days, we will gently lift the boxes off the seeds planted in the first box. Did the seeds with the rock box on top start to grow? Did the seeds under the empty box grow? What happened? What happened with the seeds planted under the coins? Did the embryos lift the coins? Did the embryos lift any coins that weigh more than the seeds? We can make a graph to show the weights of the seeds compared to the weights of the coins they could lift. There is a plant called "saxifraga" (pronounced "sax-i-fraz- ya") which can actually break through some kinds of rocks that are on top of it. It can even break through concrete! Plants are part of erosion. When a plant starts growing on the little bit of soil that has blown onto a rock, the roots will slowly grow down into the pores of the rock. Over time, the roots will cause the rock to break apart. What a surprise that is!!  Any problems with this page? Send URL to
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