Part A

Seed Structure

1. Obtain one each of the following seeds—pea, bean, and corn.

2. Remove the seed coats of the pea and bean seeds. Open the seeds, and locate the two cotyledons in each seed.

3. Using the stereomicroscope, examine the embryos of the pea seed and the bean seed.

4. In your lab report, draw the pea and bean embryos and label all of the parts that you can identify.

5. & ^ A CAUTION Put on a lab ^r apron, safety goggles, and gloves. In this lab, you will be working with a chemical that may irritate your skin or stain your skin and clothing. If you get a chemical on your skin or clothing, wash it off at the sink while calling to your teacher. If you get a chemical in your eyes, immediately flush it out at the eyewash station while calling to your teacher. Use the scalpel carefully to avoid injury. Examine a corn kernel, and find a small, oval, light-colored area that shows through the seed coat. Use the scalpel to cut the kernel in half along the length of this area. Place a drop of iodine solution on the cut surface.

6. Use the stereomicroscope to examine the corn embryo. In your lab report, sketch the embryo and label all the parts that you can identify.

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