Question

label figure 10.8-10.11

I ho el Division Marchantiophyta (Liverworts) LA Photographic Arlas for the Botany Laboratory, 7e; p. 77) There are two main types of liverworts, referred to as thallose and leafy types. Because it is particularly large, we will study Marchant, an example of a thallose liverwort, Gametophyte Stage With the aid of a dissecting microscope, examine a specimen of Marchant that has gemmae cups present. Note the surface texturing on the dichotomously branched thallus la plant body that is not differentiated into roots, stems, or leaves because there is no vascular tissue). This texturing is due to a complex system of air chambers at the upper surface. On the lower surface, you should find a number of rhizoids. What is their function? soe Longitudinal section of a Marchanitia gemmae FIGURE 10.9 CD 30X 1. Examine the gemmae cup. Inside are numerous multicellular structures, the gemmac (sing. - gemma). which are asexual reproductive structures. Label the thallus and gemmae cup in Figure 10.8. FIGURE 10.10 Marchantia thallus with antheridiophore, 1.5. FIGURE 10.8 Marchantia thallus with gemmae cups, 1.5x. 2. Now examine a prepared slide of a longitudinal section of a gemmae cup. Notice the multicellular nature of the gemmae. Examine the top portion of the thallus, and notice the small photosynthetic cells and the air chambers there. The lower part of the thallus is primarily for food storage. 3. Label the gemmae, rhizoids, thallus, and air space in the photograph of a gemmae cup (Fig. 10.9). 4. Next, examine specimens of Marchantia plants with sex- ual reproductive structures on them. These structures are referred to as antheridiophores and archegoniophores, elongated structures bearing the antheridia and archego- nia respectively. Notice that the end of the antheridio- phore is a relatively solid, disklike structure, while the archegoniophore terminates in a region that has several fingerlike projections. Label the antheridiophore, arche- goniophore, and thallus in Figures 10.10 and 10.11. FIGURE 10.11 Marchantla thallus with archegoniophore, 1.5 x 106 Exercises for the Botany Laboratory

Answer 1

gemmae air spaces thallus I ho Division Marchantiophyta (Liverworts) (A Photographic Arlas for the Botany Laboratory, 7e; p. 77) There are two main types of liverworts, referred to as thallose and leafy types. Because it is particularly large, we will study Marchantia, an example of a thallose liverwort. Gametophyte Stage With the aid of a dissecting microscope, examine a specimen of Marchantia that has gemmae cups present. Note the surface texturing on the dichotomously branched thallus (a plant body that is not differentiated into roots, stems, or leaves because there is no vascular tissue). This texturing is due to a complex system of air chambers at the upper surface. On the lower surface, you should find a number of rhizoids. What is their function? 129 Longitudinal section of a Marchantia gemmae antheridia 1. Examine the gemmae cup. Inside are numerous multicellular structures, the gemmac (sing, = gemma), which are asexual reproductive structures. Label the thallus and gemmae cup in Figure 10.8. antheridiophore gemma cup thallus thallus FIGURE 10.10 Marchantia thallus with antheridiophore. 1.5x. archegonia archegoniophore FIGURE 10.8 Marchantia thallus with gemmae cups, 1.5%, 2. Now examine a prepared slide of a longitudinal section of a gemmae cup. Notice the multicellular nature of the gemmae. Examine the top portion of the thallus, and notice the small photosynthetic cells and the air chambers there. The lower part of the thallus is primarily for food storage. 3. Label the gemmae, rhizoids, thallus, and air space in the photograph of a gemmae cup (Fig. 10.9). 4. Next, examine specimens of Marchantia plants with sex- ual reproductive structures on them. These structures are referred to as antheridiophores and archegoniophores, elongated structures bearing the antheridia and archego- nia respectively. Notice that the end of the antheridio- phore is a relatively solid, disklike structure, while the archegoniophore terminates in a region that has several fingerlike projections. Label the antheridiophore, arche- goniophore, and thallus in Figures 10.10 and 10.11. thallus FIGURE 10.11 Marchantla thallus with archegoniophore, 1.5x. 106 Exercises for the Botany Laboratory

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