roots, stems, and leaves the three main plant organs are roots, stems, and leaves. these organs are...

Download Roots, Stems, and Leaves The three main plant organs are roots, stems, and leaves. These organs are made up of three main kinds of tissues: –dermal tissue

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  • Roots, Stems, and LeavesThe three main plant organs are roots, stems, and leaves.These organs are made up of three main kinds of tissues:dermal tissuevascular tissueground tissue.

  • Plant TissuesDermal tissue the skin of a plant. protects the plant and prevents water loss.

  • Plant Tissues cont.Vascular tissue moves water and nutrients throughout the plant. Xylem tissue moves water. made up of tracheids and vessel elements. Phloem tissue moves sugars. consists of sieve tube elements and companion cells.

  • Plant Tissues cont.Ground tissue- all the cells that lie between dermal and vascular tissues.made up mostly of parenchyma cells. Parenchyma cells have thin cell walls and function in photosynthesis and storage. Collenchyma and sclerenchyma These cells have thick cell walls that help support the plant.

  • Plant Tissues cont.Meristematic tissue- responsible for plant growth. Produces new cells by mitosis. Develop specialized structures and functions when mature in a process called differentiationfound at the tips of stems and roots.

  • Roots2 types of roots-Taproot : One big primary root + small secondary rootsFibrous root: Primary and secondary roots = same size

    Functions: anchor a plant in the ground. absorb water and dissolve nutrients from the soil.Root pressure forces water upward through the xylem toward the stem.

  • StemsFunctions:They produce leaves, branches, and flowers. They hold leaves up to the sunlight. They also carry water and nutrients between roots and leaves.Arrangement of tissues Monocots: vascular bundles are scattered Dicots : vascular bundles are arranged in a ring.These vascular bundles contain xylem and phloem tissue.Growth:Primary : grows longerSecondary: grows wider

  • Leavesmain organs of photosynthesis. make food (sugars) made up of a specialized ground tissue called mesophyll cells.Mesophyll : many chloroplasts responsible for photosynthesisveins : Xylem and phloem tissues Stomata: small openings prevent water loss.

  • Transport in PlantsCapillary action:Cohesion- forces between water and water moleculesAdhesion forces between water and other moleculesTranspiration pull water moves from areas where there is plenty of water to areas where there is little water. Pressure-flow hypothesisexplains how phloem transport happenssugars move from areas of high concentration to areas of low concentration.

  • DCBAWhich part is responsible for photosynthesis?

  • If a plant becomes too dry, are the stomata in the leaves more likely to be open or closed?

  • Which tissue is found in the center of a plant stem?A. dermal tissueB. vascular tissue C. ground tissue

  • Which of the three kinds of ground tissue serve mainly for storage? A.parenchyma B. collenchyma C. sclerenchyma

  • Cells that can differentiate into many plant tissues are found in A. the vascular cylinder.B. dermal tissue.C.meristematic tissue.

  • Photosynthetic tissues in a leaf include theA.phloem.B.vein.C.palisade mesophyll.

    A process in which water is lost through the leaves of a plant is calledA.transpiration.B.photosynthesis.C.glycolysis.


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