. 6.Examine the cut surfaces of the corn grain with a dissecting microscope. You can see the tissues of the embryo plant and above the embryo, is the endosperm. 7.Examine the surface of the one-half of the corn grain with the hand lens. Hold the grain with the pedicel down. On the embryo, find two tips of tissue, one pointing upward and one pointing downward. Which is the epicotyl and which is the hypocotyl?
8.With a dissecting needle, try to separate the epicotyl from the tissue behind it. It will bendoutward. What parts of the plant will develop from the epicotyl?9.Gently separate the tip of the hypocotyl from the cotyledon with the dissecting needle. Becareful not to break off the tip. Note that the hypocotyl is embedded in the cotyledon.What parts of the plant develop from the hypocotyl?10. Draw and label the cut corn grain. Label the ovary wall, endosperm, cotyledon,epicotyl, hypocotyl, and radicle. Conclusions and Applications:1.Name the parts of the monocot seed and the dicot seed. Monocot Parts Dicot Parts 2.What is the function of the micropyle? 3.What are 2 functions of a seed coat?4.What is the function of the cotyledons of a dicot seed?5.What is a silk scar?6.If an ear of corn had 205 grains, how many silks would there have been? Explain.Part 2: Seed Germination LabPurpose:To compare and contrast dicot and monocot seeds AFTER germination.
Materials : Germinating lima beans and corn seeds (1-2 days old), Ruler, Paper towels. Procedure: 1. Place each seed on a paper towel. 2. Measure the distance from the tip of the root to the top of the developing plant in centimeters (cm). 3. Make a drawing of each type of germinating seed in the proper block. 4. Label the following on the drawings: Lima Bean: radicle, hypocotyl, cotyledon, seed coat, epicotyl, root hairs Corn Seed: primary root, branch roots, epicotyl, coleoptiles. Corn Seed Bean Length Drawing s Analysis Questions: Lima Bean: 1.Is the lima bean an example of a monocot seed or a dicot seed?2.What develops from the radicle?3.What serves as the source of food for the developing embryo?4.What purpose do the root hairs serve?5.Once planted, what part emerges from the soil first?6.Will the cotyledon emerge from the soil?Corn Seed:1.Is the corn seed an example of a monocot seed or a dicot seed?
2.What develops from the primary root?3.What emerges from the soil first?4.Does the endosperm of the corn seed emerge from the soil?5.What develops into the leaves of a corn plant?6.What serves as the source of food for the developing embryo?7.What is the purpose of the coleoptile? Conclusions:
You've reached the end of your free preview.
Want to read all 9 pages?
- Fall '19