Plant Structure and Growth

Topic 9.1

9.1.1: Plan diagrams in the stem and leaf of a dicotyledonous plant

Plan diagrams are used to show the distribution of tissues (for example, xylem and phloem) and do not show individual cells. They are sometimes called "low-power" diagrams. You can place the mouse pointer on to the plan diagram of the leaf to see the tissues labeled in an electron micrograph of the leaf. Placing the mouse pointer on any of the labels on the right-hand side of the diagram will produce a pop-up window with the function of that label.

The Leaf

You need to close the popup window by clicking on the x in the corner or it will stay open.

Leaf labels upper epidermis palisade mesophyll xylem phloem spongy phloem

The Stem

Stem Labelled

9.1.2: Monocot and Dicot sturctural differences

Outlined below are the structural differences between monocotyledonous and dicotyledonus plants. Please note that only three of the differences listed below need to be identified.

otherelements

9.1.3: Modifications of roots, stems, and leaves

Modifications of roots, stems, and leaves and their functions are identified in the figure below.

otherelements

9.1.4 &: 9.1.5: Apical and Lateral Meristems

Dicotyledonous plants have apical and lateral meristems. Apical meristems are sometimes referred to as primary meristems, and lateral meristems as cambium. Meristems generate new cells for growth of the plant.

apical and lateral meristems

9.1.6: The role of auxins in phototropism

Use the figure below to explain the role of auxins in phototropism. Place the mouse pointer on the figure will explain how auxins cause bending in plant stems.

phototropism link phototropism animation
Auxins
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