Presentation on theme: "SYSTEMS IN PLANTS Plants are multicellular Organisms with"— Presentation transcript:
1SYSTEMS IN PLANTS Plants are multicellular Organisms with Two obvious distinguishing features:They are usually green They cannotMove from place to place.
2SYSTEMS IN PLANTSFlowering plants have two main “body systems:” the root system and the shoot system.These two body systems work together to perform all of the functions necessary to keep the plant alive:exchanging gases with its surroundingsmoving water and nutrients around internallyreproducing
3SYSTEMS IN PLANTSThe root system is typically the part of the plant that grows underground. Its functions are to anchor the plant, to absorb water and minerals from the soil, and to store food.The shoot system of flowering plants is made up of three parts: the leaf, the flower, and the stem.The leaf is where photosynthesis takes place. Chloroplasts in a plant’s leaves use carbon dioxide, water, and light energy to produce glucose and oxygen.
4SYSTEMS IN PLANTSFlowers contain male or female reproductive structures. Male reproductive structures produce pollen grains. Female structures produce eggs. After eggs are fertilized by pollen, seeds form within a specialized structure called a fruit.
5SYSTEMS IN PLANTSA plant’s stem supports the plant’s leaves and flowers, and provides a way to transport the materials the plant needs.People use flowering plant roots, leaves, stems, and flowers (plus the seeds and fruits that come from them) for food, flavourings, fibres, and medicines.
6PLANT TISSUE SYSTEMSSimilar to stem cells in animals, meristematic cells are undifferentiated plant cells that can form any kind of specialized tissue.Plant tissues are classified into three tissue systems, each containing a variety of specialized cell types that carry out specific functions within the plant.
7PLANT TISSUE SYSTEMSThe three major tissue systems of plants aredermalvascularground
8PLANT TISSUE SYSTEMSThe dermal tissue system forms the outmost layer of a plant. It includes both epidermal and peridermal tissues. These tissues are what you see when you look at the leaves, stem, and roots of a plant.Epidermal tissue (epidermis) is the thin layer of cells that covers the surfaces of leaves, stems, and roots. In woody plants, the epidermal tissue is replaced by periderm tissue, which forms bark on stems and large roots.
9PLANT TISSUE SYSTEMSSome cells of the dermal tissue system absorb water and minerals from the surrounding soil. Others produce a layer of wax to waterproof the surface of leaves. Still others contain chemical irritants for defence.
10PLANT TISSUE SYSTEMSA plant’s vascular tissue system is like a network of tubes that reaches from the roots up the stalk to the leaves. When a plant’s roots absorb water and nutrients from the soil, the vascular tissue system transports the water and nutrients to the various parts of the plant, where they are needed for growth.
11PLANT TISSUE SYSTEMSThere are two types of vascular tissue: xylem and phloem.Xylem carries water and dissolved minerals from the roots to the rest of the plant. Water moves through the tubes in one direction.Phloem transports solutions of sugars produced during photosynthesis, as well as other dissolved nutrients and hormones. In phloem tissue food materials may be transported in either direction: downward from photosynthesizing leaves to stem and roots or upward from the root and stem to the leaves.
12PLANT TISSUE SYSTEMSGround tissue cells are part of the third major tissue of plants. They are the filler between the dermal and the vascular tissues.Ground tissues perform a variety of functions, depending ontheir location within the plant: In the green parts of theplants, they manufacture nutrients by photosynthesis.In the stems, they provide storage and support.In the roots, they store carbohydrates
13Home workPage 128 questions 1 to 7Page 133 questions 2, 3 and 6