Presentation on theme: " What are the functions of roots. List the 2 main types Take out outline Lets see the book questions."— Presentation transcript:
What are the functions of roots. List the 2 main types Take out outline Lets see the book questions
Lesson 3 Page
What are the functions of roots, stems, and leaves? How do seeds become new plants? What are the structures of a flower?
Section 4 Structures of Seed Plants Chapter 12 Roots Root Functions The following are the main functions of roots: Roots supply plants with water and dissolved minerals via absorption from soil Roots anchor or hold plants securely in the soil. Roots store surplus food made during photosynthesis Click to see root transport
Taproot systems 1 main root, or tap root, that grows downward. Fibrous systems several roots that spread out from the base of the stem.
Section 4 Structures of Seed Plants Chapter 12 Root hairs help to anchor plant and absorb nutrients and water
Section 4 Structures of Seed Plants Chapter 12 Roots, continued Root Structure The layers of cells that cover the surface of the roots is called the epidermis. After water and minerals are absorbed by the epidermis, they diffuse into the center of the root where the vascular tissue is located. A root cap can be found at the end of the root. The root cap protects the tip and helps the root continue to grow.
Root Structure Roots have many structures. Plant Structures Root Cap protect the root These cause the root to grow longer
Section 4 Structures of Seed Plants Chapter 12 Stems Stem Functions A stem connects a plant’s roots to its leaves and flowers. A stem also has the following functions: Stems support the plant body. Stems transport materials between the root system and the shoot system. Some stems store materials such as food. Two Main Types Woody and Herbaceous
Stem Structure The woody stem of a tree contains many different structures. What are the active xylem and phloem on the tree trunk? Plant Structures
Section 4 Structures of Seed Plants Chapter 12 Herbaceous Stem Stems are soft thin flexible
Section 4 Structures of Seed Plants Chapter 12 Woody Stems Trees and shrubs have rigid stems made of wood and bark. These stems are called woody stems.
Leaf function- capture sun light and do photosynthesis Structure-Each structure helps a leaf produce food. Plant Structures
Section 4 Structures of Seed Plants Chapter 12 Allow CO2 to enter Opens and closes Stoma These cell contain chloroplast
Stomata Stomata can slow water loss. Plant Structures Transpiration Click for animation the process by which moisture is carried through plants from roots to stomata, where it changes to vapor and is released to the atmosphere. Or evaporation of water from plant leaves
Section 4 Structures of Seed Plants Chapter 12 Leaves, continued Leaf Exceptions Some leaves have functions other than photosynthesis. The leaves of many cactuses are modified as spines. These spines keep animals from eating the cactuses. The leaves of sundews are modified to catch insects, which the sundew digests.
Section 3 Seed Plants Chapter 12 The Structure of a Seed embryo Protects the embryo and food from drying out
Plant Structures Story of a Seed Which is the seed’s embryo, cotyledons, and seed coat on the diagram? Stem and root Stored Food
Animals eating fruit Seeds hook onto clothing & fur Water in rivers or streams carry seeds Wind Some plants eject seeds
Embryo begins to grow and pushes out of the seed Seeds remain dormant or inactive until conditions are right for germination. All seeds need water, oxygen, and proper temperature in order to germinate.dormant
Chapter 12 Flowers- the reproductive structure for angiosperms Pollination-the transfer of pollen from male to female parts of the plant Sepals-The modified leaves that make up the outermost ring of flower parts and protect the bud are called sepals. Petals are broad, flat, thin leaflike parts of a flower.
Chapter 12 Flowers, continued Stamens and Pistils The male reproductive structure of a flower is called a stamen. A Pistil is the female reproductive structure of a flower.
Structures of a Typical Flower Plant Structures
Note: Theses are short answer questions. Can a gymnosperm be classified as a Dicot? Explain why. Explain how you people are beneficial part of a plants seed dispersal and pollination? Work on completing Section 3 Mapping Diagram
Note: Theses are short answer questions. Why do you think angiosperms enclose their seeds in fruit?
Plant Structures Roots Types Fibrous Tap Structures Root Cap Xylem Phloem Root Hairs Surface Cells Stems WoodyHerbaceous LeavesFlowers