Plant Anatomy - Western Oregon University

Plant Anatomy - Western Oregon University

Plant Anatomy Systems and Tissues Plant Structure Root and shoot systems are made up of basic plant organs: roots, leaves, stems, flowers. Root system What are the major

functions of roots? Shoot system functions What are some of the major functions performed by the shoot system? Structure is used in classification Two main categories of flowering plants: monocots and dicots

The two groups are distinguished on the basis of flower parts, leaf veins, and other structural features. Flowers Monocots: flower parts in 3s Dicots: flower parts in 4s, 5s, 6s

Leaves Monocots: parallel veins in leaves Dicots: network of veins in the leaves Roots Monocots: fibrous root system with no main tap root.

Dicots: Main tap root, with smaller side roots branching off. Seeds Monocots: single cotyledon; endosperm and cotyledon are separate Dicots: two

cotyledons; endosperm is contained in the cotyledon. This flower is probably a: 50% 50% 1. Monocot 2. Dicot 1

2 This flower is probably a: 50% 50% 1. Monocot 2. Dicot 1 2

This flower is probably a: 50% 50% 1. Monocot 2. Dicot 1 2 W

O R K If youre asked to distinguish between monocots and dicots, which plant parts would make this task easiest? T O G E

T H E R Plant Tissues Dermal tissue Ground tissue Vascular tissue Copy this table: Primary Sub-types Structure Functions

tissue type Dermal Epidermis Periderm Parenchyma Ground Collenchyma Sclerenchyma Xylem

Vascular Phloem Dermal tissue: Epidermis How is an epidermis of a plant similar to your epidermis? What does the epidermis do? What features do you see in these cells?

Dermal tissue: Periderm How is the periderm like the layer of dead skin cells on human skin? What does the periderm do? What features do you see in these cells?

Ground tissue: Parenchyma What can you see in these parenchyma cells? What are some functions of parenchyma cells? Ground Tissue: Collenchyma How might

support cells be different from other plant cells? Plants dont have a skeletal system as humans do. What holds a plant up? What features do you see in these cells? Ground tissue: Sclerenchyma

How are these thick-walled cells different from collenchyma cells? What features do you see in these cells? Sclerenchyma cells are dead at maturity. Why might that be?

Vascular tissue: Xylem Xylem tissue moves water. What features would the cells need to carry out this function? What features do you see in these cells? Vascular tissue: Phloem Phloem tissue

moves sap, which is sugar dissolved in water. What features would the cells need to carry out this function? What features do you see in these cells? Wood contains cells that are dead at maturity. They must

be: 25% 1. 2. 3. 4. 25% 25% 25%

Phloem Xylem Parenchyma Collenchyma 1 2 3 4

Potatoes are tubers (modified stems) that store starch. Most of a potatos tissue must be: 25% 1. 2. 3. 4. 25%

25% 25% Sclerenchyma Collenchyma Parenchyma Vascular tissue 1 2

3 4 Linen thread for weaving fabric is spun from bast fibers that come from the stem of the flax plant. Bast fibers are long, tough, and strong. Which plant tissue type are they most likely made up of? W O

R K T O G E T H E R

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