Contemporary Biological Problems Lab Observation: Lycophytes Lycophytes (phylum

Question

Contemporary Biological Problems Lab Observation: Lycophytes Lycophytes (phylum Lycophyta) are commonly called club mosses, Lycophytes are representat vascular plants. They have an aerial stem and a horizontal root (rhizome with attached rhizoids) both of which have vascular tissue. The leaves are called microphylls because they have only one strand of vascular tissue. Ground Pines ive of the first 1. Examine a living or preserved specimen of Lycopodiam (Fig. 14.9) 2. Note the shape and the size of the microphylls and the branches of the stems 3. Note the terminal clusters of leaves, called strobili, that are club-shaped and bear sporangia. 4. Label strobill, leaves, stem, and rhizoids in Figure 14.9 5. Examine a prepared slide of a Lycopodiwm that shows the sporangia with spores inside. The spore develops into a tiny microscopic gametophyte that remains in the soil. Figure 14.9 Lycopodium. in the club moss Lycapodium, green photosynthetic stems are covered by scalelice leaves, and spore-bearing leaves re elustered in strobilIL Seve Solun Photoshot Observation: Pteridophytes Molecular (DNA) studies tell us that the whisk ferns, horsetails, and ferns are closely related. Whisk Ferns Psilotwm is representative of whisk ferns, named for their resemblance to whisk brooms 1. Examine a preserved specimen of Psilotum, and note that it has no leaves. The underground stem, called a rhizome, gives off upright, aerial stems with a dichotomous branching pattern, where bulbous sporangia are located (Fig. 14.10) What generation are you examining? 2. Label a sporangium, the stem, and the rhizome in Figure 14.10b. 4-8 174 Laboratory 14 Nonvascular Plants and Seedess Vascular Plants

Explanation / Answer

1) we are observing the sporophyte generation .

2)

label the parts

1 - Strobilus

2 - sporophyte

3 - node

4 - rhizome

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