Bio Lab Wksht & HW Questions 68

Bio Lab Wksht & HW Questions 68 - plants? Examine...

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63 Cycadophyta Ginkgophyta Gnetophyta The Coniferophyta is by far the most abundant and successful of the gymnosperm phyla. This Phylum consists of trees like pines, spruces, firs and larches. The objective of this part of the exercise is to become familiar with a typical gymnosperm life cycle, using pine as our example. You should become familiar with the structure and significance of pollen grains, ovules, and seeds. Begin your examination of the life cycle of pine by viewing living sporophytes available on display. Can you come to any conclusions about the type of terrestrial environment in which you would expect to see these
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Unformatted text preview: plants? Examine frozen material of male cones. Note how small they are. The cone is composed of a number of leaves that bear microsporangia on their lower surfaces. You will need to consult prepared slides of a longitudinal section through a male cone to fully understand this relationship. The microsporangia are the site of meiosis in the male cone. What are the products of meiosis? Are they visible on the slide? Make sketches and label all components of a male pine cone....
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