Growing With Science Blog

Did you ever wish you could take your children on a walk in the woods, but for whatever reason it was not possible? Here in Arizona when the temperature exceeds 115°F, we start looking for alternatives to a hike outside. Here are a few places for fun and educational virtual hikes. If nothing else these sites can give you ideas for things to do during actual walks.

Designed with children in mind:

The Smithsonian National Zoo has “A Walk in the Forest” with six different animated walks. One allows you to take soil samples and measure soil pH. Another helps you learn how to identify trees using keys. Each is led by an animation of a real employee of the zoo. How cool is that!

University of Illinois Extension has a virtual walk in the woods and Secret life of trees. Both show photographs of actual forests. There’s a teacher’s guide with ideas, resources and many extras.

For children or adults:

Ever wanted to visit a redwood forest? Muir Woods has a virtual tour. There are 92 photographs, and you get to choose where you look next. The virtual tour always has good weather.

Florida Hikes has slide shows from various Florida parks.Check out the giant snails at Pine Land. Isn’t fun to see how different the landscape is at the different parks?

Finally, YouTube has a number of videos of walks. I like this one because the tour guide discusses, what else, science!

Hope you enjoy these virtual walks in the woods, and can talk your own walk soon.

Where’s your favorite place for a hike?

I’m “sprucing” things up here at Growing with Science in preparation for hosting the Festival of the Trees Carnival at the end of the month. For the next few weekend science fun posts, we’ll be learning about trees and doing some fun tree science activities.

I. What is a tree?

Most of us recognize a big tree when we see one, but sometimes it may be hard to tell whether a plant is a large shrub or a small tree. What do you think? Brainstorm and write down all the words you use to describe a tree.

One definition might be “a tree is a perennial, woody plant that grows to at least 20 feet tall and has an erect (straight up) main stem.” Talk about what that means and if all the trees you know will fit this definition. Can you think of something more? Let us know what you decide.

II. Why study trees?

Trees are so important. Can you think of a list of benefits of trees? Here’s just a few we thought of:

• shade (really important in Arizona!)
• food and shelter for wildlife
• rubber
• paper and paper products
• source of wood products such as furniture, houses, pencils, musical instruments
• food for us
• fuel for heating
• medicines such as aspirin and quinine
• produce oxygen
• conserve water
• reduce pollution

Can you add to this list? Do some research to find more benefits of trees.

III. External parts of a Tree

Vocabulary:

• bark
• trunk
• crown
• leaf/needle
• branches
• roots
• twigs
• nuts
• fruit
• flowers
• buds

Make index cards with each of these names (make sure you have at least one card for each child participating.) Punch holes in the cards with a hole punch.  Cut pieces of yarn of various lengths. Find a tree outside and have the children attach the cards to the correct parts with pieces of yarn – a fun way to decorate a tree. Take extra cards and draw any parts that are missing, such as flowers, nuts or fruit. Add those to the tree where they might be found. Older children can discuss the function of each of the parts, such as roots hold up the tree (support) and bring water into the tree. (Scissors speed up card removal when you are finished.)

Sketching trees is a good way to learn the shape of different kinds. Claire Walker Leslie has an excellent guide to sketching trees (click on the Guide to Tree Sketching resource to download a .pdf file). Sketch a tree and label the parts if you can’t go outside.

IV. How Trees Grow – The Internal Parts of a Tree

See if you can find a “tree cookie,” a cross-sectional piece of wood through a tree trunk. These are often available at craft stores. Those with the bark still on are the best.

Internal parts of a tree:

• cambium – layer of active cells that divide to form inner bark and sapwood
• sapwood
• xylem – water carrying elements (in sapwood)
• phloem-food carrying elements (inner bark)
• heartwood

Look at the tree cookie and see how new rings are added each year. Explain how the tree only grows from the cambium and cutting it (for example by carving initials on a living tree), damages its ability to grow and live. A fun demonstration of how a tree grows might be to add layers of clothes to a doll or person, to show how the tree expands by adding layers. See if you can tell how old the tree that made the tree cookie was when it was cut down by counting the rings. (More information on internal parts).

We’ll continue with more activities next week. Until then, here are two sources of more information about trees:

Illinois Department of Natural Resources has  lesson plans in .pdf format

Arbor Day Foundation has education links and online games.

Hope you enjoy our celebration of tees this month. If you have any suggestions for activities or websites, please let us know.

Once again, our activities this week are inspired by a book, this time it is The Hive Detectives: Chronicle of a Honey Bee Catastrophe (Scientists in the Field Series) by Loree Griffin Burns and photographs by Ellen Harasimowicz. (We also used Loree Burn’s Tracking Trash: Flotsam, Jetsam, and the Science of Ocean Motion for activities in a previous post). Check Wrapped in Foil for a review of the book.

You may have heard on the news that honey bees are disappearing. The Hive Detectives follows the research of four scientists trying to figure out what is going on, as well as discussing a lot of general information about honey bees.

In the 1990’s I co-authored a set of lesson plans about honey bees, called “Africanized Honey Bees on the Move” for the University of Arizona. At the time the Africanized honey bees had just moved into Arizona, and many people were concerned about them. The lesson plans have a number of hands-on activities to do with many aspects of honey bee biology. If you go to a grade level, it will list appropriate lessons. Each lesson has links to activity and information sheets. Many of the lessons can be adapted to mixed-age groups.

Here are some honey bee-related activities and links:

1. Gardening for bees

Honey bees require pollen and nectar from flowers in order to survive. One simple activity is to investigate what kinds of bee-friendly plants grow in your area and have your children design and plant a bee garden.

You may wonder if encouraging honey bees to visit flowers in an area with children might be dangerous. It turns out that bees collecting food, called foraging bees, are not likely to sting unless they are stepped on, caught or otherwise threatened. This might not be an appropriate activity, however, for children who are allergic to bees.

(The first two websites were recommended in the book).

Pollinator.org has planting guides to help you find appropriate plants.

The Haagen-Dazs help the honey bees website has simple instructions for a bee garden, as well as funny videos.

What can the layperson do to help the honey bee has a lot of practical information about gardening for honey bees and other things you can do to help honey bees.

And don’t forget the Great Sunflower Project mentioned in a previous post.

These flowering plants help all kinds of pollinators, not just honey bees.

2. Honey bees and water

Any idea what these bees are doing?

Honey bees need a lot of water, especially in the summer. They use the water to cool inside the hive, to prevent the wax honeycomb from melting. You can see the tongue, called a proboscis, sucking up the water at the edge of this lily pad.

Getting water can be dangerous business for a honey bee. Honey bees often end up falling in, like the ones you see in swimming pools. Can you design a safe place for honey bees to gather water to add to your garden?

3. Honey bee communication and dances.

One of my favorite lessons was always doing the honey bee waggle dances as a way of learning how honey bees communicate.

Dancing under a polarized sky also has a lot of information about honey bee dances.

4. Honey bee senses

Honey bees perceive the world in a way that is very different from humans.

Honey bee senses lesson

What a bee sees

5. Honey bee and other bee nests

Investigate where honey bees live, where beekeepers keep bees and what it is like inside a hive.

The Insect Architects post has a some information about honey bee homes.

You can supply nest sites for other kinds of bees.

I don’t know whether you can read it, but the sign says “Digger Bee Nest Site.” We have left a patch of soil for the tiny digger bees to nest in.

The solitary and social bees lesson has a explanation of the different kinds of bees and how to construct an orchard mason bee nest.

There are a lot of ways to use honey bees as examples for science and nature lessons. Please let me know if you would like more information about any of these activities or if you have found a great website that helps children learn about honey bees.

Books to help you find out more:

In addition to The Hive Detectives,

you might be interested in these other books about bees from a precious post:
For young children you might want to try The Magic School Bus Inside a Beehive

Are you a Bee? is an intriguing book that compares humans and honey bees in an informative and gently humorous way.

The Bumblebee Queen by April Pulley Sayre (Author), Patricia J. Wynne (Illustrator) is a positively gorgeous book, chock full of good information. Any child who is interested in bees will love this book.

A Country Year by Sue Hubbell has some interesting tidbits on keeping honey bees, although it is about many other aspects of the natural world as well. A few of the chapters can some information that could be considered adult, such as she briefly discusses her divorce. You might want to read it first to determine if it is suitable for your older children. I have to say my son and I love it and I read it to him almost every summer (a summer tradition).

Book of Bees by Sue Hubbell contains a lot more technical information about beekeeping. There are many other books about beekeeping available, but this one warms my heart because it also shows more of the human side of the experience.

Note: the book that inspired this post was found at our local library.