BIOL 1202 Lecture Notes - Lecture 35: Axillary Bud, Vascular Plant, Bark
Document Summary
The basic design of land plants has two parts (see fig 35. 2): Perennials: some lose the above ground functionality, grow for many years repeatedly due to storage in root structure in tough times such as winter. Annuals: can only grow for one year and then they die. As a seed begins to grow the first root to emerge is the primary root (see fig 35. 3). Stored food in seed needs hydration. (water comes from root) In monocots, this primary root grows out and is replaced by a fibrous root system composed of many roots of about equal size. In dicots, the primary roots then turn into the taproot system, which has one main root that lateral roots branch off. The epidermis of the root is very thin and has no waxy cuticle (holds water in plant). In addition, the epidermis forms root hairs (see fig 35. 3) to increase the surface area.
