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Plant Structure and Function. What’s the Difference?

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Presentation on theme: "Plant Structure and Function. What’s the Difference?"— Presentation transcript:

1 Plant Structure and Function

2 What’s the Difference?

3 What In This Unit 4 What makes plant cells work? 4 What’s the difference between plant and animal cells 4 What’s inside of plants cells 4 The breakdown of Stems, Roots, Leaves and Flowers

4 4 For cells in a plant to multiply or enlarge a plant must have the following: 4 Carbon dioxide, water, oxygen, nitrogen, phosphorus, potassium and trace elements.

5 Plants & Animals 4 There are basically two differences between plants and animals. 4 Plant have the ability to make their own food.

6 4 The second difference is in their respiration. 4 Plants take in carbon dioxide and give off oxygen.

7 4 Plant Cells

8 4 Plant cells consist of the following: 4 Cell Wall: non-continuous structure surrounding the plasma membrane

9 4 Vacuole: cavity in the cytoplasm filled with cell water 4 Cytoplasm: total protoplasm in the cell except the cell nucleus 4 Mitochondrion: breaks down compounds for the cell

10 4 Nucleus: a small round body that contains the nucleolus and chromosomes.

11 Plant Tissue Systems 4 Meristematic Tissue: This is growth tissue where cell division and enlargement occur and is found near the tips of roots and stem buds.

12 Simple Tissues 4 Epidermal tissue: This tissue is one-cell thick and forms the outer layer of flowers, leaves, and many types of fruits.

13 4 Parenchyma tissue: This tissue comprises the fleshy part of fruits, roots, and tubers. 4 Its,main function is to store food and water.

14 Complex Tissue 4 Xylem tissue: This tissue is called “wood” in vascular plants. 4 Its principal functions are to conduct water and support the plant

15 4 Phloem tissue: This tissue also conducts material in the plant and gives the plant support. 4 Its main function is to transfer food from the leaves to other parts of the plant

16 4 Parts of The Plant

17 The Plant Roots 4 The function of the plant’s roots are to absorb nutrients and water from the soil and to anchor the plant. 4 The root system can makeup 50% of a plants weight.

18 4 There are two types of root systems soilless roots which include aerial (ivy), and aquatic(water lily). 4 Soilborne roots are classified into tap and fibrous roots.

19 4 Tap roots are those roots which have a long main root such as a carrot or pine tree. 4 Fibrous roots spread out such as grass

20 Parts of the Root 4 At the tip is the roots cap, where cell division occurs and it pushes down into the soil. 4 Root hairs are used to help take in nutrients

21 The Plant Stem 4 The major function of the stem is to join the root and leaf systems. 4 Some photosynthesis also takes place in the stem.

22 Parts of the Stem 4 Node- jointed part of the stem on which leaf or flower buds develop 4 Internode- major part of the stem between the nodes.

23 4 Axillary Bud- bud found at the leaf axil from which flowers and branches arise. 4 Terminal Bud- tip or end of the shoot were growth takes place.

24 4 Petiole- is a stem-like leaf structure that attaches the leaf to the stem

25 Woody Stems 4 Outerbark- protects the interior of the plant from insects and diseases and excessive heat and cold. 4 Innerbark- carries food manufactured in leaves to the branches, trunk, and roots

26 4 Cambium- layer of cells between the bark and wood where growth is diameter occur and the formation of annual rings.

27 4 Sapwood(xylem)- carries sap from the roots to the leaves 4 Heartwood- is inactive sapwood which is darker in color and gives strength to the plant

28 4 Pith- is the dark center in the heartwood core.

29 Leaves 4 Leaves are the food factory of the plant producing all food that is used by the plant and stored for later use by the plant or by an animal. 4 Leaves vary in shape and size; with most of them being flat 4 The arrangement of the leaves differ alternate, opposite, whorled,

30 External Leaf Structures 4 The petiole is the stalk that attaches the leaf to the stem 4 The blade which is the flat part of the leaf 4 The midrib which is the large center vein from which all veins extend 4 The margins which are the edges of the leaf

31 Internal Leaf Structures 4 The skin of the leaf is called the epidermis which is a single layer of cells. The epidermis provides protection from water loss. 4 The guard cells open and close a small space or pore on the underside of the leaf called the stoma 4 The stoma allows the plant to transpire. This gives off moisture and exchange of gases.

32 4 In the inner part of the leaf are the chloroplast. The chloroplast are filled with chlorophyll which give the leaf it’s green color. 4 With the use of chlorophyll, minerals, sugars sunlight and carbon dioxide the plant goes through photosynthesis

33 4 The formula for photosynthesis is the following: 4 6CO2 + 6 H2O Kcals (light energy) = C6H12O6 (Glucose) + O2

34 Flower 4 The purpose of the flower is the reproduction of the plant. This can be done through fruits and seed. 4 The reason flowers are colorful is to attract insects for pollination

35 Parts of the Flower 4 The sepals are the green leaflike part of the flower located at the base and are used to protect the flower bud. 4 The petals are actually leaves and are the most striking part of the flower 4 The stamen makes up the male reproductive part of the plant. This includes the anther which holds the pollen. The filament is the slender stalk that holds the anther

36 4 The pistil is the female reproductive part of the flower. This includes the stigma which is sticky and catches the pollen, the style which is a long tube that carries to the ovary, the ovary is where the egg is produced.

37 4 A complete flower has both male and female parts 4 An incomplete flower contains only one of the parts


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