Animal diversity

... Student Name: Chan Yu Yan Maggie 25th September, 2006 Student ID: 50920875 BCH 2001 Organisms and Environment: Plant Diversity No.2 Bryophytes and Seedless Vascular Plants Introduction Evolving from green algae, plants are now divided into three main group which are bryophytes, seedless vascular plants and seed plants. Bryophytes such as liverworts, hornworts, and mosses are small leafy plants which do not have vascular tissue. They are relatively unspecialized, but successful in many terrestrial environments especially moist areas. The most conspicuous part of a nonvascular plant is the green photosynthetic gametophyte, which supports the smaller sporophyte nutritionally. On the other hand, seedless vascular plants have well-developed conducting tissues in their sporophyte. In vascular plants, specialized tissue called xylem conducts water and dissolved minerals within the plant, and tissue called phloem conducts sucrose and hormones within the plant. Seedless vascular plants have a much more conspicuous sporophyte than nonvascular plants do, and many have well-developed conducting

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