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

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Presentation on theme: "SC.912.L.14.7 Relate the structure of each of the major plant organs and tissues to physiological processes."— Presentation transcript:

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

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

3 Stomata  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

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

5 Vascular 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

6 LEAF TISSUE ORGANIZATION

7 Function 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

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

9 Xylem  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

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

11 Corms  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 CormsBulbsTubersRhizomesStolons

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

13 Tap 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 TapAerialFibrousAdventitious

14 Root 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

15 Internal 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.

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

17 Petals  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

18 The 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


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