3.1: Transition to Living on Dry Land Plants are adapted to living on land where light is more available and carbon dioxide diffuses freely in the air. To conserve water, leaves and stems [3, 4, & 5] are usually covered by a waxy cuticle Shoot Systems – Leaves  perform photosynthesis and gas exchange  Stem supports the plant and may perform photosynthesis Root System: Root also contain tissues that transport those nutrients to the stem Alga is supported by the surrounding water. Whole alga performs photosynthesis, absorbs water, CO2, and minerals from the water. These additional adaptations allowed plants to move onto dry land. 1. A cellulose cell wall prevents plant cells from drying out and provides support. 2. Plants have a sporic life cycle (with alternation of generation) 3. Most plants enclose the embryo to protect it and keep it from drying out, and use wind to disperse spores or seeds. 4. Vascular plants have tube-like, elongated xylem tissues that carry water and nutrients from the roots and living phloem tissue that transp[orts the carbohydrates manfactured during photosynthesis throughout the plant. Xylem tissue contains a tough support material called lignin, which allows trees to grow to great heights.