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Copy of Biology Chapter 23 Section 1 Plant Tissues
Transcript of Copy of Biology Chapter 23 Section 1 Plant Tissues
Cells that lie between dermal and vascular tissues make up the ground tissues. Vascular tissue is composed of two tissue groups.
Xylem consists of tracheids and vessel elements. It mainly carries water and nutrients from the roots.
Phloem consists of sieve tube elements and companion cells. It brings sugars produced in the leaves to
the rest of the plant. Vascular Tissue Stoma Cuticle Epidermis Epidermal cells make up dermal tissue.
The outer surfaces of epidermal cells are covered with a thick waxy layer, known as the cuticle. Dermal Tissue Plant Tissue Systems
Plants consist of three main tissue systems:
ground tissue When water pressure within guard cells decreases, the stoma closes. Leaf Functions When water pressure within guard cells is high, the stoma open. Leaf Functions Leaflet Compound leaf Simple leaf Petiole Bud Stem To collect sunlight, most leaves have thin, flattened sections called blades. Leaf Structure Blade Leaves:
are a plant’s main photosynthetic systems.
increase the amount of sunlight plants absorb.
Adjustable pores called Stomata conserve water and let oxygen and carbon dioxide enter and exit the leaf. Leaf Structure Node Bud Internode Node Stem Structure and Function Leaves attach to the stem at structures called nodes.
The regions of stem between the nodes are internodes. Stems provide:
a support system for the plant body.
a transport system that carries nutrients.
a defense system that protects the plant against predators and disease. Stem Structure Root hairs The root’s surface is covered with cellular projections called root hairs.
Root hairs provide a large surface area through which water can enter the plant. Root Structure and Growth Root hairs Types of Roots
The two main types of roots are:
taproots, which are found mainly in dicots, and
fibrous roots, which are found mainly in monocots. Roots:
absorb water and dissolved nutrients.
anchor plants in the ground.
protect the plant from harmful soil bacteria and fungi.
cooperate with mycorrizhae fungi to increase water absorption Seed Plant Structure
The three principal organs of seed plants are roots, stems, and leaves.
These organs perform specialized functions essential to autotrophic life on land. Seed Plant Structure Vascular Tissue Stoma Cuticle Epidermis The epidermis of many leaves is covered by the cuticle. Leaf Structure Specialized Tissues in Plants Vascular Structure Plant Structure and Functions
When would a
plant need to
close the stoma? Source to Sink