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9.1 Plant Organs
Flowering plants have a root system that contains the roots and a shoot system that contains the stems and the leaves.
1. List several functions of roots.

2. How are underground stems differentiated from roots?
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Plant Organs - Introduction

Labeling Exercises
Organization of Plant Body (27.0K)
9.2 Monocot Versus Dicot Plants
Flowering plants are classified into two groups, the monocots and the dicots.
3. What are cotyledons?

4. What is the significance of the division between monocots and dicots?
9.3 Plant Tissues
Plant cells can be organized into three types of tissues: epidermal tissue, ground tissue, and vascular tissue.
5. List three types of ground tissue cells and state their functions.

6. Where is vascular tissue located in the various plant organs?
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Ground Tissue
Dermal Tissue
Vascular Tissue

Art Quiz

Animation Quiz
Vascular System of Plants
9.4 Organization of Roots
In longitudinal section, a dicot root tip has a zone where new cells are produced, another where they elongate, and another where they differentiate and mature.

In cross section, dicot and monocot roots differ in the organization of their vascular tissue.

Some plants have a taproot, others a fibrous root, and others have adventitious roots.
7. From what region does a root elongate, and from where can it send out lateral roots?

8. What is the significance of having different types of roots in different plants?
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Labeling Exercises
Dicot Root Tip (35.0K)
Primary Meristems (14.0K)
9.5 Organization of Stems
Dicot and monocot herbaceous stems differ in the organization of their vascular tissue.

All stems grow in length but some plants are woody and grow in girth also.

Stems are diverse and some plants have horizontal aboveground or underground stems.
9. How do herbaceous stems differ from woody stems?

10. What type of tissue is the bark of a tree?
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Animation Quiz
Girth Increase in Woody Dicots

Labeling Exercises
Stem Tip (21.0K)
Herbaceous Dicot Stem Anatomy (0.0K)
Woody Dicot Stem (1) (0.0K)
Woody Dicot Stem (2) (0.0K)
Woody Dicot Stem (3) (0.0K)
Secondary Growth in a Stem (0.0K)
9.6 Organization of Leaves
The bulk of a leaf is composed of cells that perform gas exchange and carry on photosynthesis.

Leaves are diverse; some conserve water, some help a plant climb and some help a plant capture food.
11. Why are parenchyma cells within the spongy mesophyll loosely arranged instead of tightly packed?
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Animation Quiz
Effect of Water on Leaves

Labeling Exercises
Leaf Structure (0.0K)

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