Year: 2013 (Page 54 of 59)

Seed of the Week: Ginkgo Tree

Our mystery seeds stumped everyone last week, although I thought the clue about having an odor might trigger someone’s memory. Maybe I should have mentioned it was a really bad odor (more about that in a minute). In any case, the seeds belong to the ginkgo or maidenhair tree, Ginkgo biloba.

Ginkgos are fascinating trees from a number of standpoints. First of all, they are Gymnosperms, which means they are more closely related to pine trees than to the flowering trees like beeches or oaks. Secondly, Ginkgo biloba is the only species of its lineage. Finally, there are no truly wild ginkgos left in China where they orginated. They are widely planted by humans, however. They make a good street tree because they are resistant to air pollution.

The common name maidenhair tree comes from the delicate leaves.

Unlike other gymnosperms, ginkgo leaves turn yellow in the fall and drop off. They are often planted for their fall color.

The seeds of the gingko have a fleshy covering that contains butyric acid. This causes the dropped fruit to have a strong rancid odor.

Here is a short video showing the seeds with their covering.

Another interesting fact about ginkgos is that they have separate male and female trees. Some trees only produce pollen and some produce fruit/seeds. People who dislike the smelly fruit tend to prefer to plant the male trees.

This short video shows seeds that have started to germinate.

These videos are from the Ginkgo Pages.

Ginkgos also have the ability to produce branches in ways that other trees can not. They are truly remarkable trees.

Do ginkgos grow where you live?

Wild Horse Scientists Book Activities

The newest book in the Scientists in the Field Series, Wild Horse Scientists by Kay Frydenborg, is sure to inspire older children to become scientists, especially if they are interested in horses. It follows biologists as they try to figure out the best ways to study and manage horses in the wild. Remarkably, very little was known about wild horses until the last few decades.

Note: this book is recommended for ages 10 and up at Amazon, but I would say ages 12 and up. Be aware up front that it contains photographs of dead, decaying horses and discusses birth control methods. It is not a picture book! For a full review of the book, see our sister blog, Wrapped In Foil.

Horse Science Activities:

1. Horse Coat Color

One of the first tasks when studying horses is to learn the names of all their coat colors so you can communicate accurately with other horse scientists. Coat color in horses is controlled by several genes, resulting in over twenty different combinations.

Do you know your horse colors? Pick out the bay, palomino, chestnut, and pinto from the photographs below. Here is a poster of horse coat colors (click to enlarge) to help.

A. What color is this reddish-brown horse?

B. What about a red-brown horse with black lower legs, mane and tail?

C. What is the name of the color of this flashy horse? (Notice it has blue eyes instead of brown).

D. What about this yellow one hiding behind the thistle?

Answers:

  • A. Chestnut
  • B. Bay
  • C. Pinto
  • D. Palomino

Some people, sometimes even horse people, might call C. a paint, but technically it is a pinto because it doesn’t have any quarter horse bloodlines. Only horses that have quarter horse (or thoroughbred) breeding are called paints when they have extensive white markings.

Older children might want to investigate the genetics of horse coat color. Jennifer Hoffman has a very cool interactive lesson to explore horse coat color genetics.

2. Horse Anatomy

Being domesticated animals, we have developed and extensive vocabulary to name the parts of the horse.

See if you can fill in the names of the parts of the horse below.

Answer sheet

3. Horse Behavior

Although horses can’t talk, you can tell what is going on with them by watching their movements.

This video explains some of the basics, such as what the positions of the ears and tail mean, as well as the fact that horses can not see directly behind themselves. Always avoid approaching a horse from the rear or near their tail because you will be in their blind spot.

4. Horse Senses:  Vision

Ever wondered how scientists study things like what an animal can see? Check out the photos of vision research using choice tests with horses (scroll down to see photographs of research in action).

Using a choice test technique, the scientists were able to determine that horses can see certain colors, but their vision is similar to a human with red/green colorblindness.

Although scientists are starting to learn more about horses, there are still a lot of questions.

Kid-friendly sites with more information:
Rutgers has Equine Science 4 Kids
Fun Horse Facts for Kids
Oregon State has horse science publications to download

And, don’t forget Wild Horse Scientists by Kay Frydenborg has a lot more information about wild horses and the scientists who study them.

Hardcover: 80 pages
Publisher: Houghton Mifflin Books for Children (November 6, 2012)
ISBN-10: 0547518315
ISBN-13: 978-0547518312

(Affiliate link)

(The book was provided by the publisher for review purposes.) Cover courtesy of Houghton Mifflin Harcourt Publishing Company.

Come visit the STEM Friday blog each week to find more great Science, Technology, Engineering and Math books.

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