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Plant Organs and Systems Levels of organization for plants and animals.

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Presentation on theme: "Plant Organs and Systems Levels of organization for plants and animals."— Presentation transcript:


2 Plant Organs and Systems

3 Levels of organization for plants and animals

4 Plant organization n Plant cell (bark cell) n Plant tissue (bark tissue) n Plant organ (leaves, stems, roots) n Plant system (work together to make, transport, and store food)

5 Plant Organs n Leaf: –function: make food, give shape, keep water inside plant Vascular bundle (xylem & phloem) lower epidermis stomata cuticle epidermis palisade mesophyll spongy mesophyll guard cell

6 Leaf Parts: n Cuticle: waxy layer on outside surface, prevents water loss n Epidermis: outer layer, protection n Mesophyll: photosynthetic tissue, made up of 2 layers n Stomata: openings on leaf surface for exchange of gases n Guard cell: controls the size of the stomata n Xylem: carries water from roots to leaves n Phloem: carries food from leaves to other parts of the plant

7 Plant Organs n Stems: –functions: hold the leaves up, moves water, food, and other materials.

8 Plant Organs n Roots: –functions: take in water and other materials from soil, hold plant in soil, store extra food

9 Plant Organs n Non reproductive parts = petal and sepal n Reproductive parts = stamen and pistil Stamen – male reproductive part contains the anther which makes the pollen containing sperm Pistil – female reproductive part contains the ovary at the bottom which holds ovule that makes the eggs Flowers:

10 In plants, sexual reproduction takes place in the flower.

11 Flower Structure

12 Female Parts n Pistil = the female structure of the flower –Ovary = contains ovules where eggs are formed. –Stigma = receives the pollen during fertilization. –Style = area between the stigma and ovary.

13 Male Parts n Stamen = the male reproductive structure of a flower –Anther = where pollen is produced. –Filament = holds up the anther –Pollen = male gamete Pollen shape is different for each plant

14 Other Flower Structures n Petals = usually colorful, leaf-like structures surrounding the male and female reproductive organs. n Sepals = found below the petals and encase the rest of the flower when it is in bud and not yet opened

15 Plant Processes n Transpiration: the evaporation of water from the stomata of leaves n Absorption: uptake of water from the roots n Response to stimulus: plants respond to external stimuli from a specific direction Ex: tropisms

16 Tropisms: n trop = turn, change n ism = thing n Phototropism = the tendency of a plant to move towards a light source n Hydrotropism = the tendency of a plant to grow with the roots reaching toward water n Geotropism = the tendency of a plant to grow with the roots downward and with the leafy parts upward

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