Presentation on theme: "PLANT BIOLOGY. PARTS OF THE PLANTS PLANT TISSUES The Classification of Plant Tissues 1.Meristematic Tissue 2.Dermal Tissue (Protective Tissue) 3.Fundamental."— Presentation transcript:
MERISTEMATIC TISSUE Types of Meristematic Tissue A plant has two types of meristem 1.Apical Meristem a) Root Meristem b) Shoot Meristem 2. Lateral Meristem a) Cork Cambium b) Vascular Cambium
1. APICAL MERISTEM Apical meristem located at the tips of the stem and it branches as well as the tips of the root and its branches. It provides growth in length. As the stem grows taller, some apical meristem moves upward and some remains in place, between the stem and leaf, where it can form new branches, leaves or flowers.
1.APICAL MERISTEM A)ROOT MERISTEM: Root meristem is composed of delicate cells that need protection The root apical meristem is protected by the root cap. Root meristem produces primary tissues that later become the epidermis, cortex, and vascular cylinder of mature plants
1.APICAL MERISTEM B)SHOOT MERISTEM: It produces new buds and leaves. It also produces epidermis, cortex, primary xylem and phloem, central pith, tissues that form the primary structure of the stem.
2. LATERAL MERISTEM(CAMBIUM) The lateral meristem provides an increase in the width of a plant; this growth is secondary growth, because apical meristem is not responsible for the growth in diameter of plant. Types of lateral meristem A) Vascular Cambium B) Cork Cambium
2. LATERAL MERISTEM(CAMBIUM) A) Vascular Cambium:
Epidermal hairs lower water loss by decreasing the flow of air over the plant surface, which in turn, slows the loss of water from the plant. Glandular hairs prevent herbivores by storing substances that are harmful to insects. Root hairs increase water uptake by increasing the surface area of the cell.
2. PERIDERM (CORK)
DIFFERENCES BETWEEN STOMA AND LENTICELS STOMA Located in epidermis Regulates its opening Guard cells have chloroplast and make photosynthesis Transpiration and gas exchange occur LENTICEL Located in periderm Is always open Has no chloroplast and does not make photosynthesis Gas exchange and little amount of water vapor is given out
FUNDAMENTAL TISSUE (GROUND TISSUE) Is composed of three tissues: Parenchyma Colenchyma Sclerenchyma These tissues can be distinguished by their cell wall structures.