PLANT STRUCTURE Big Q What are the primary

PLANT STRUCTURE Big Q: What are the primary functions of the main tissue system of seed plants?

ENGAGE - UNTAMED SCIENCE ➤ List some of the special adaptations mentioned in the video about plants.

EXPLAIN - SEED PLANT STRUCTURE ➤ There are three principle organs of a seed plant: ➤ 1. Roots - anchor plants to the soil, absorb water and dissolved nutrients, transport around the plant ➤ 2. Stems - supports plant body, carries nutrients, defends the plant against diseases and predators, produce leaves and reproductive organs ➤ 3. Leaves - pores control water loss, photosynthesis happens here

EXPLORE - WHAT PART DO YOU EAT? ➤ Investigate the plants to determine which part of the plant is our food.

EXPLAIN - PLANT TISSUE SYSTEMS ➤ Dermal Tissue - protective outer layer of the plant ➤ Contains: ➤ 1. Epidermis - outer layer ➤ 2. Cuticle - waxy coating on the epidermis, prevents water loss ➤ 3. Trichomes - sometimes found on leaves, look fuzzy, protect the leaf

EXPLAIN - PLANT TISSUE SYSTEMS ➤ Vascular Tissue - supports the plant body and transports water and nutrients throughout the plant ➤ Contains: ➤ 1. Xylem - move materials from roots to leaves ➤ 2. Phloem - move materials from leaves to plant

ELABORATE - XYLEM AND PHLOEM ➤ Xylem Tracheids - long narrow tubes with tough cell walls Vessel Elements - larger tubes, stack like tin cans, found in angiosperms Contain lignin - water resistant ➤ Phloem Sieve Tube Elements have small holes for nutrient movement Companion Cells - helps the sieve move materials

EXPLAIN - PLANT TISSUE SYSTEM ➤ Ground Tissue - produce and store sugars ➤ Contains: ➤ 1. Parenchyma - site of photosynthesis, food storage ➤ 2. Collenchyma - supports stem and leaves ➤ 3. Sclerenchyma - strong seed coats, protection

EXPLAIN - ROOTS ➤ Two Types: ➤ 1. Taproot System - one long root system ➤ 2. Fibrous Root System - many roots Root Hairs - create surface area Cortex - move water, store starch Endodermis - inner tissue Vascular Cylinder - contain xylem and phloem Apical Meristem - cell division Root Cap - protection

EXPLAIN - STEMS ➤ Parts of the stem: ➤ 1. Nodes - leaves attach here to the stem ➤ 2. Buds - contain apical meristems for leaf development ➤ 3. Vascular bundle - xylem and phloem

ELABORATE - STEM GROWTH ➤ Primary Growth elongation of cells produced by the apical meristem Takes place in all seed plants ➤ Secondary Growth increases the thickness of stems and roots Takes place in conifers and dicots Creates vascular and cork cambium tissues

ELABORATE - READING A TREE’S HISTORY ➤ Analyze the picture and answer the questions

EVALUATE - PLANT STRUCTURE ➤ 1. What are three important functions of the stem? ➤ 2. Describe the main functions of the root. ➤ 3. How do functions of the stem relate to the functions of the roots of a plant?