Biology 2601A/B Lecture Notes - Lecture 14: Casparian Strip, Meristem, Root Cap
12 Dec 2017
School
Department
Course
Professor
Document Summary
Lecture 14 - water and nutrient absorption 1: root structure and function. Heat stress: wilting - due to a loss of turgor pressure, angled leaves - mechanism to avoid radiation absorption, rolled up leaves - avoid water loss by minimizing leafs sa for transpiration, mortality. Stomata: co2 in, water out: on the leafs surface, lose (cid:449)ater (cid:271)e(cid:272)ause (cid:455)ou (cid:272)a(cid:374)(cid:859)t ope(cid:374) the sto(cid:373)ata to get co2 in and avoid water loss. Figure: leaf cross section, palisade and spongey mesophyll cells, where photosynthesis occurs, xylem and phloem, transport tissues, enclosed by a ring of protective cells. Inside leaf - air spaces that contain lots of water, humid. How does water get into the plant: root systems! Figure: structure of the tip of a root, root cap, protects the rest of the root. Fairly delicate, small, living cells make up the root tip: mucigel sheath.
