c. vascular tissue. c. epiphyte. Liverworts. Mosses grow on tree trunks, and horsetails (Figure 14.9) display their jointed stems and spindly leaves on the forest floor.Yet, seedless plants represent only a small fraction of the plants in our environment. Rhizoids are protuberances that extend from the lower epidermal cells of bryophytes and algae.They are similar in structure and function to the root hairs of vascular land plants.Similar structures are formed by some fungi.Rhizoids may be unicellular or multicellular. With vascular tissue, the plants could finally circulate resources throughout the plant. Seedless, vascular plants such as ferns formed vast ancient forests in low-lying wetlands during the Carboniferous period (360–299 million years ago). This allowed them to evolve to much larger sizes but they were still seedless and relied on spores. ACKNOWLEDGEMENTS Seedless vascular plants require water for sperm motility during reproduction and, thus, are often found in moist environments. Sorus are a. plants that live anchored to an object or another plant. rhizoids. Liverworts have colonized many habitats on Earth and diversified to more than 6,000 existing species (Figure14.2.2a).Some gametophytes form lobate green structures, as seen in Figure 14.2.2b.The shape is similar to the lobes of the liver and, hence, … Some terrestrial plants developed vascular tissues (xylem and phloem), fibers and secondary growth for support, true roots, stems, and leaves rhizoids small root-like structures which anchor the plants to substrates and allow diffusion of water into plant cells Why are rhizoids helpful to the survival of certain seedless plants? Succulent plants such as cacti, aloes, and agaves, beat the dry heat by storing plenty of water in their roots, stems, or leaves. b. clusters of sporangia on the undersides of fern fronds where fern spores develop. Seedless vascular plants reproduce through unicellular, haploid spores instead of seeds; the lightweight spores allow for easy dispersion in the wind. Seedless vascular plants are plants that contain vascular tissue, but do not produce flowers or seeds. B) Stomata, when closed, allow CO2 to diffuse into plants. D) Stomata are important in terrestrial plants because they allow CO2 to diffuse into the plant. Certain types of mosses, called PEAT MOSSES, grow in vast expanses of wetlands in the northern parts of the world. C) Stomata are important in terrestrial plants because they allow the roots to absorb water and nutrients from the soil. The life cycles of these plants have two distinct stages – one in which SPORES are produced, and one in which sex cells (sperm and eggs) are produced. ____ 38. _____ 5. It's hot in the desert. ____ 37. c. Answer: D An incredible variety of seedless plants populates the terrestrial landscape. Plants originated in aquatic environments and gradually migrated to land during their long course of evolution. Liverworts (Marchantiophyta) may be viewed as the plants most closely related to the ancestor that moved to land. The characterization of further rhizoid-specific genes and their regulatory elements in basally diverging plants will allow us to assess the importance of changes in cis-regulatory elements in re-wiring a rhizoid developmental programme to give root hairs on the sporophyte. Most seedless plants live in damp and shady habitats. Blood vessels in people are to vessel elements in plants as the circulatory system is to a. dermal tissue. 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