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Why is Rudolp's nose red?

Secrets of Desert Plants

An interview with biologist Tina Wilson from the Desert Botanical Garden in Phoenix Arizona. Listen in as Dr. Biology learns how cacti and other desert plants keep their cool.

Content Info | Transcript


MP3 download | 14MB

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Topic Time
Intro - 00:00
Overview of the Desert Botanical Garden. 01:43
What are succulent plants? 02:27
How does a saguaro cactus keep keep from losing its water? 03:51
Can a saguaro cactus live for years without water? 04:41
How tall is a saguaro cactus after 5 years and how do you know the age of a saguaro? 05:24
A brief introduction into photosynthesis. 06:47
Where does photosynthesis happen? 08:18
What color of light are plants using for photosynthesis? 10:02
CAM plants - breathing at night. 10:52
How do plants move water from their roots up to the top of the plant? 13:22
Osmosis 14:04
Xylem and Phloem and a fun way to remember what each does. 14:49
Water and its properties - adhesion, cohesion, capillary action. 16:03
Transpiration. 16:42
Activity to observe properties of water. 17:42
Where are the leaves on the saguaro cactus? 18:18
Why do cacti have spines? 19:13
Plants that have leaves that are not green and why the leaves change color in the fall? 19:36
Why do plants go dormant? 21:06
More about the desert botanical garden. 22:29
Cacti didn't always look the way they do today? 23:30
Cacti didn't always look like this? 24:05
The butterfly pavilion. 25:18
Migrating Monarch article and coloring page. 25:49
What's special about the DBG in the winter time - and also summer flashlight tours. 26:12
Three questions - when did you first know you wanted to be a biologist? 27:20
What would you be or do if your were not a biologist? 27:57
What advice do you have for someone wanting to be a biologist? 28:47
Sign-off 29:20

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Secrets of Desert Plants

Audio editor: Charles Kazilek

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Share to Google Classroom

Be part of Ask A Biologist

by volunteering, or simply sending us feedback on the site. Scientists, teachers, writers, illustrators, and translators are all important to the program. If you are interested in helping with the website we have a Volunteer page to get the process started.