NAME________________________ DATE_____ HOUR_____

MATERIALS NEEDED: Soaked bean seeds, Soaked corn seeds, forceps, iodine, droppers, dissecting scope, one sided razor blade.

PROCEDURE: MAKE ALL OF YOUR SKETCHES ON THE BACK OF THIS PAPER!

THE DICOTYLEDON SEED

1. Obtain a bean seed.
2. Sketch and label the outside structures of the seed
3. Remove the seed coat and test it for starch by adding a drop of iodine solution. CAUTION IODINE STAINS CLOTHING
4. Separate the two cotyledons by pulling them apart!
5. Sketch and label the inside structures!
6. Remove the embryonic plant
7. Scratch one of the cotyledons and test it for starch in the same manner
8. Under a dissecting scope, observe the embryonic plant.
9. Sketch and label the embryonic plant
10. Break open the embryonic plant and test if for starch

1. Obtain a corn seed.
2. Sketch and label the outside structures of the seed
3. Cut the corn seed in half with a one-sided razor blade. USE EXTREEM CAUTION!
4. Sketch and label the internal structures of the seed!
5. Remove the seed coat from one half and test it for starch
6. Test the other side of the seed for starch.

CONCLUSIONS:

1. Describe the function of the following structures: seed coat, hypocotyl, epicotyl, radicle, cotyledon.

 

 

 

 

2. Which part of the corn seed contained the most starch? Why?

 

 

 

 

 

3. Which part of the bean seed contained the most starch? Why?

 

 

 

 

 

4. What might cause a seed to be dormant?

 

 

 

 

5. What conditions are needed for a seed to germinate?