Plant Organs and Tissues and Their Functions

Plant Organs and Tissues and Their Functions

This article discusses the major plant organs and tissues and their relation to physiological processes. Specifically, it focuses on the function of leaves as the site of gas exchange, respiration, photos

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PowerPoint presentation about 'Plant Organs and Tissues and Their Functions'. This presentation describes the topic on This article discusses the major plant organs and tissues and their relation to physiological processes. Specifically, it focuses on the function of leaves as the site of gas exchange, respiration, photos. The key topics included in this slideshow are . Download this presentation absolutely free.

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Slide1SC.912.L.14.7    Relate the structure of each of the major plant organs and tissues to physiological processes

Slide2Function of Leaves Make food through photosynthesis  Site of gas exchange  Respiration  Photosynthesis  Store food IDENTIFY THE PRINCIPAL ORGANS AND TISSUES OF SEED PLANTS:  LEAVES

Slide3Stomata Openings in the epidermis mainly located on the underside of leaves  Allow for exchange of gases (CO 2 , O 2 , H 2 O) Guard Cells  Two cells located on each side of stomata  Opens and closes stomata Cuticle  Waxy substance that covers the leaves & stems  Waterproof layer that keeps water in plants  Transparent to allow light to enter for photosynthesis TISSUES OF THE  LEAF :   EPIDERMIS

Slide4Palisade mesophyll Primary site of photosynthesis Spongy mesophyll  Contains air & chloroplasts  Site of photosynthesis and gas exchange TISSUES OF THE  LEAF :   MESOPHYLL LAYER

Slide5Vascular Bundles Transport system  Called veins  Found in spongy mesophyll  Two Forms  Phloem  moves food from leaf to the rest of the plant  Xylem  moves water & minerals up from the roots to the leaves TISSUES OF THE  LEAF


Slide7Function of Stems Movement of materials  Water & minerals from roots to leaves  Manufactured food from leaves to roots  Support leaves & reproductive structures  Food storage IDENTIFY THE PRINCIPAL ORGANS AND TISSUES OF SEED PLANTS:  STEMS

Slide8Terminal Bud Bud on the end of the stem. Axillary Lateral Bud  Bud on the side of the stem. EXTERNAL  STEM  STRUCTURE

Slide9Xylem The tissue that transports water & nutrients  up  from roots to stems & leaves. Phloem  Tissue that transports food  down from leaves to roots. Cambium  Thin, green, actively growing tissue located between bark & wood and produces all new stems cells. INTERNAL  STEM  STRUCTURE

Slide10Bark Old, inactive phloem. Heartwood  Old, inactive xylem. Sapwood  New, active xylem. INTERNAL  STEM  STRUCTURE

Slide11Corms Underground stem  Solid, fleshy, scale covered Bulb  Layers of fleshy scales that overlap each other  Underground stem Stolens  Stem that grows horizontally above the soil surface SPECIALIZED TYPES OF  STEMS Tubers  Food Storage Area  Short, thick underground stem Rhizomes  Underground stems that produce roots on the lower surface and extend leaves and flower shoots above ground Corms Bulbs Tubers Rhizomes Stolons

Slide12Functions Anchors the plant  Absorbs water & minerals  Stores food IDENTIFY THE PRINCIPAL ORGANS AND TISSUES OF SEED PLANTS:  ROOTS

Slide13Tap Roots One main root, no nodes  Ideal for anchorage  Penetration is greater for water and food storage Aerial Roots  Clinging air roots  Short roots that grow horizontally from the stems and fasten plant to a support  Absorptive air roots  Absorb moisture from the air DIFFERENT TYPES OF  ROOTS Fibrous Roots  Many finely branched secondary roots  Shallow roots cover a large area  More efficient absorption of water & minerals  Roots hold the soil to prevent erosion Adventitious Roots  Develop in places other than nodes  Form on cuttings & rhizomes Tap Aerial Fibrous Adventitious

Slide14Root Cap Indicates growth of new cells Root Hairs  Tiny one celled hair-like extensions of the epidermal cells located near the tips of roots.  Increase surface area.  Absorb water & minerals. PARTS OF  ROOTS

Slide15Internal structure of Roots Much Like Those Of Stems With Phloem, Cambium And Xylem Layers Phloem  The outer layer.  Carries food down the plant. Xylem  The inner layer.  Carries water & minerals up to the stem.

Slide16IDENTIFY THE PRINCIPAL ORGANS AND TISSUESOF SEED PLANTS:  FLOWERS Functions  Contain the sexual organs for the plant.  Produces fruit, which protects, nourishes  and carries seeds.  Attracts insects for pollination.

Slide17Petals Brightly colored  Protects stamen & pistils.  Attracts pollinating insects.  Collectively called the corolla. Sepals  Outer covering of the flower bud.  Protects the stamens and pistils when flower is in bud stage. PARTS OF THE  FLOWER

Slide18The STAMEN  is the male reproductive part.  It is made up of  Anther  Produces  pollen  which fertilize the ovules  Filament  Supports the anther The  PISTIL  is the female reproductive part.  It is made up of  Ovary  Enlarged portion at base of pistil  Produces ovules which develop into seeds  Stigma  Holds the pollen grains during fertilization  Style  Connects the stigma with the ovary  Supports the stigma so that it can be pollinated FLOWER  REPRODUCTION pistil