1. On the following slides, the green sections are the most important – Underlined words = vocabulary!
Hyperlinks are shown in purple.
Background Image
Plant Systems

2. Image
The Texas Bluebonnet (Lupinus texensis) is our state flower and a plant native to Texas.
Remember that plants are NOT dead, but very much alive and composed of eukaryotic cells!
In this unit we will discuss the systems in plants, specifically transport, reproduction, and response.
Introduction

4. Response
Just like animals, plants respond to changes in their environments (called tropism) – Tropism Animation
There are four main types of tropisms:
Gravitropism/Geotropism
Hydrotropism
Phototropism
Thigmotropism

5. Response
Gravitropism/Geotropism = response in plants that make it grow either with the pull of gravity or against
Positive gravitropism/geotropism is when roots grow in the direction of gravity
Negative gravitropism/geotropism is when shoots (stems) grow away from gravity
Negative geotropism
Positive geotropism

6. Hydrotropism response
Hydrotropism = response that bends the plant towards water (usually the roots)
Hydrotropism response
Normal plant response

7. Response
Phototropism = response that bends the plant towards light

8. Response
Thigmotropism = response that bends it around an object (EX a vine wrapping around an arbor)

9. Response Cont.

10. Response Cont.
Another type of response, specifically to changes in pressure, is called a nastic response.
The most common example is the infamous Venus flytrap which closes its leaf when the plant senses an insect to digest nutrients using enzymes.
Nastic Slideshow

11. A hormone is a chemical produced in one part of an organism that is transported to another part where it causes a physiological change - plant hormones regulate the growth and development in plants –
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Some hormones include:
Auxins – promote cell elongation and growth
Gibberellins – promote cell elongation, bud development and seed germination
Cytokinins – stimulate mitosis and cell division
Plant Hormones

12. Plants provide consumers with oxygen to breathe, food, shelter, as well as cleaning the air and water for the planet.
Just like animals, plants are active responders within various environments to survive and thrive.
Their use and importance is numerous; humans use plants with healing properties in medical treatments.
Photograph by Luis del Río
Conclusion