21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C The student is expected to: 5B examine specialized cells, including roots, stems, and leaves of plants...; 10B describe the interactions that occur among systems that perform the functions of transport, reproduction, and response in plants; 10C analyze the levels of organization in biological systems and relate the levels to each other and to the whole system

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C KEY CONCEPT Plants have specialized cells and tissue systems.

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant tissues are made of three basic cell types. Parenchyma cells are the most common plant cell type. –store starch, oils and water –help heal wounds to the plant –have thin flexible walls

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C –they are strong and flexible. –celery strings are strands of collenchyma. –they have unevenly thick cell walls. Collenchyma cells provide support to a growing plant.

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C –second cell wall hardened by lignin –die when they reach maturity –used by humans to make linen and rope Sclerenchyma cells are the strongest plant cell type.

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C Plant organs are made of three tissue systems. Dermal tissue covers the outside of a plant. –protects the plant –secretes cuticle of leaves –forms outer bark of trees

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C –provides support –stores materials in roots and stems –most commonly made of parenchyma Ground tissue is found inside a plant.

21.1 Plant Cells and Tissues TEKS 5B, 10B, 10C stem leaf root –two networks of hollow tubes –xylem transports water and minerals –phloem transports photosynthetic products Vascular tissue transports water, minerals and organic compounds.