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Transport in Plants (part 1): Monocotyledons vs Dicotyledons

Learning Outcomes<br>Students should be able to:<br>- identify the positions and explain the functions of xylem vessels, phloem (sieve tube elements and<br>companion cells) in sections of a herbaceous dicotyledonous leaf and stem, using the light<br>microscope

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Transport in Plants (part 1): Monocotyledons vs Dicotyledons

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  1. Transport of materials in flowering plants Chapter 9 Copyright © 2010 All Rights Reserved

  2. Lesson Objectives What are vascular bundles? Xylem Phloem Cambium Identifying vascular bundles in microscopic slides Characteristics of Monocots vs Dicots Translocation studies ▪ 1. 2. 3. ▪ ▪ ▪ Copyright © 2010 All Rights Reserved

  3. Identifying vascular bundles Copyright © 2010 All Rights Reserved

  4. Identifying a vascular bundle xylem phloem Copyright © 2010 All Rights Reserved

  5. Identifying a vascular bundle Copyright © 2010 All Rights Reserved

  6. How to identify xylem vessels from phloem in microscopic slides? Xylem vessels have Thicker walls - because xylem walls are lignified (either annular, spiral or pitted) to provide mechanical support to the plant Larger lumen compared to phloem ⚫ 2. Copyright © 2010 All Rights Reserved

  7. A vascular bundle cambium Copyright © 2010 All Rights Reserved

  8. Test Yourself Copyright © 2010 All Rights Reserved

  9. Vascular bundles are arranged in a ring (roots of monocots) Copyright © 2010 All Rights Reserved

  10. Vascular bundles are scattered throughout (stems of monocots) Copyright © 2010 All Rights Reserved

  11. Vascular bundles are arranged in a star shape (roots of dicots) Star shape Copyright © 2010 All Rights Reserved

  12. Vascular bundles are arrange in a ring (stems of dicots) Copyright © 2010 All Rights Reserved

  13. Monocotyledons vs Dicotyledons Copyright © 2010 All Rights Reserved

  14. Many types of plants Copyright © 2010 All Rights Reserved

  15. Copyright © 2010 All Rights Reserved

  16. Copyright © 2010 All Rights Reserved

  17. Monocots vs dicots Monocot Dicot Embryos One cotyledon (seed leaves) Two Cotyledon One large taproot with little hairs off it Roots Fibrous roots Vascular bundles are arranged in a ring Vascular bundles are arranged in a star shape Roots Vascular bundles are scattered throughout Vascular bundles are arranged in a ring Stems Leaves Veins are usually parallel Veins are usually netlike Floral Parts Multiples of three Multiples of four or five Pollen Grains One pore or slit Three pores or slits Grasses, corn, wheat, palms, bamboo, lilies, orchids, yucca Rose, violet, sunflower, water lily, columbine Example plants Copyright © 2010 All Rights Reserved

  18. Vascular bundles arranged in a star shaped Vascular bundles arranged in a ring Copyright © 2010 All Rights Reserved

  19. Vascular bundles are scattered throughout Vascular bundles are arranged in a ring Copyright © 2010 All Rights Reserved

  20. Monocot or dicot? False garlic - has 6 petals; monocot Hibiscus – has 5 petals; dicot Copyright © 2010 All Rights Reserved

  21. Monocot or dicot? Monocotyledons - there are no branched veins (parallel veins) Dicotyledons - branched veins in the leaf Copyright © 2010 All Rights Reserved

  22. Orientation of xylem and phloem in the stem, root and leaf of dicotyledonous plants Copyright © 2010 All Rights Reserved

  23. Transverse section through stem and root Cambium: actively dividing cells between xylem and phloem; unspecialised Copyright © 2010 All Rights Reserved

  24. Locate the xylem and phloem phloem xylem Copyright © 2010 All Rights Reserved

  25. Locate the xylem and phloem xylem phloem Copyright © 2010 All Rights Reserved

  26. Copyright © 2010 All Rights Reserved

  27. Leaf structure xylem phloem Copyright © 2010 All Rights Reserved

  28. Quiz Copyright © 2010 All Rights Reserved

  29. Fill in the blanks for the table below No. of cotyledon (s) Type of venation on leaves Type of root system Floral parts in multiples of … Arrangement of vascular bundles in Root Stem Monoco tyledon 1 parallel fibrous 3 ring scattered Dicotyle don 2 ring taproot 4/5 star-shaped netlike Copyright © 2010 All Rights Reserved

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