Stuck in someone else's frames? break free!
|
|
 |
 |
 |
|
  |
|||
|
GROWING IN SAND UNTIL PLANTS NEED SOIL Do you think that plants need soil so that they can grow? Why do you think that is? This project will show us how long plants can grow without soil. We have some wet sand, which has been washed very carefully so as to get out any dirt that may be in it. We will put the sand into pots, and plant a few seeds in each pot. They can all be in a sunny place, or we could even put them in different places, so that they have different amounts of light. If we put them in different places, we should number the pots and make a list, showing where each pot is. We must remember to keep the sand moist so that they seeds don't dry out. When we see a little green above the sand, we will write the date beside that pot's number. Each day, we can measure the little stem, and also make a note when leaves appear. Which seeds will germinate first? Oh oh! Some of the stems and leaves are beginning to look a little droopy, even though we kept the sand moist. We know they don't need water. What do you suppose is wrong? Do you think the little plants might be hungry? We have already learned that the cotyledons (part of the seed which has food for the embryos) give the embryos the nourishment they need to germinate. Do you think that plants need to have food regularly, like we do? If they use all the food in the cotyledons, where do they get food then? Could it be that soil has food in it? How could we find out? We could transplant some of the little plants into pots with potting soil, and see if they stand up straight and begin to grow again.  Any problems with this page? Send URL to
webmaster. Thank you!
We publish two newsletters a couple of times a month. To subscribe, send a blank email to the appropriate email address. Topica will send you a message asking if you really intended to subscribe - just click reply - that's it! Free Recipe Collection Newsletter: Jewish Recipe Collection Newsletter:
Tired of Geek Speak when
|
 |
||||||||||||||||||||||||||||||
