9.1 Plant Structure

08/04/2013 § Leave a comment

BLOG STILL IN THE WORKS (it’s a long section).


Essay Questions

  1. The main part of growing plants are roots, stems and leaves. Draw a plant diagram to show the arrangement of tissues in the stem of a dicotyledonous plant.
  2. Draw a labelled diagram showing the tissues present in a dicotyledonous leaf.
  3. Explain the functions of the different tissues of a leaf.
  4. Explain the role of auxin in phototropism.
  5. Outline the adaptations of plant roots for absorption of mineral ions from the soil.
  6. Describe the process of mineral ion uptake into roots.
  7. Describe how water is carried by the transpiration stream.
  8. Explain how abiotic factors affect the rate of transpiration in a terrestrial plant.
  9. List three abiotic factors which affect the rate of transpiration in a typical mesophytic plant.
  10. Explain how wind affects the rate of transpiration from a leaf.
  11. Outline adaptations of xerophytes.
  12. Outline the role of the phloem in the active translocation of biochemicals.
  13. Draw the structure of a dicotyledonous animal-pollinated flower
  14. Describe the metabolic events of germination in a starchy seed.
  15. Explain the conditions needed for seed germination.
  16. Explain how flowering is controlled in long-day and short-day plants.



1. Figure 5 is a diagram of a dicotyledon stem based on the transverse section shown in Figure 2. Deduce whether the areas on the diagram represent single cells or areas of tissue. —> The areas on the diagram represent areas of tissue.

2. Outline two similarities in structure between the monocotyledon stem and the dicotyledon stem. —> Both have an epidermis, phloem, xylem, cortex, and vascular bundle. Both stems are turgid.

3. Compare the position of xylem and phloem in the two types of stem. —> For both stems, the xylem and phloem are attached. The phloem is always small than the xylem. The phloem is always on the tip of the xylem, which is usually somewhat oval-shaped. The phloem for a dicotyledon hangs off of the xylem more than that of the monocotyledon.

4. Deduce why monocotyledon stems cannot thicken in the same way as dicotyledon stems. —> They cannot thicken in the same way because their vascular bundles are different from the vascular bundles of a dicotyledon stem. Dicots have cambia and woody fibers while monocots don’t.

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