LAB4answers-07

LAB4answers-07 - LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE...

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LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE GENERAL STRUCTURE OF ANGIOSPERMS Answers to the lab manual questions: 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. Male cones usually occur on higher branches and farther from the trunk than the female cones. Why would this be so? The pollen released by the male cones is wind dispersed. Therefore, positioning the male cones towards the outside of the tree facilitates the pick up and dispersal of pollen. 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? The endodermis controls the movement of water in and out of the vascular bundle with passage cells allowing water to leave the xylem at specific points. Are the internodes variable in length?
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LAB4answers-07 - LAB 4 NONSEED PLANTS, GYMNOSPERMS, AND THE...

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