LAB 4 Answers

LAB 4 Answers - LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE...

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LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE GENERAL STRUCTURE OF ANGIOSPERMS Answers to questions in the lab exercise: Examine fern sporophytes. Are these structures (fonds, rhizomes, and roots) haploid or diploid? Diploid. Are the walls (of the sporangia) uniformly thickened? No. The annulus is much thicker than the lip cells. As the sporangium matures and dries the annulus contracts. This pulls on the thin lip cells, eventually rupturing them and releasing the spores. Examine a male cone. Female cones usually occur on higher branches and, and male cones are usually located farther from the trunk than the female cones. Why would this be so? The positioning of the male cones below the female cone reduces the chance of self-fertilization occurring from pollen falling straight down. The pollen released by the male cones is wind dispersed. Therefore, positioning the male cones on the outside of the tree facilitates the pick up and dispersal of pollen to areas beyond that tree. Examine Brassica . At what level is the main root thickest in diameter? It is thickest at the top, then tapers off downwards. Can you identify a level on the main axis of the plant where the root “joins” the stem or is there a “transition” zone that is not recognizable as root or shoot? There is a thin transition zone. Can you see any significance in the positioning of the passage cells?
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LAB 4 Answers - LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE...

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