Month: April 2009 (Page 3 of 5)

Academy of Science and Technology Blog Carnival 3

What a treat, we’re hosting the third edition of the Academy of Science and Technology Blog Carnival today.

Before starting, let’s take a moment and revisit Academy of Science and Technology 1. In the Garden Science – The Great Sunflower Project post at the Homeschooled Year blog, we found out about how to get involved in an interesting project to study bees in urban settings. The project coordinators supply a free package of sunflower seeds of a specific variety. You plant them, grow the flowers and then watch the bees. We got our free package of sunflowers in the mail on Saturday and we are excited to start them. Hopefully the seeds will grow in our oven-like climate and we will get to see some bees.

bee on sunflower

Biology

If you are interested in learning more about bees,  GrrlScientist has an essay filled with pictures and valuable reference books, discussing the natural history and economic importance of Bombus species — the bumble bees — and what you can do to help keep them happily living in your garden.  These fascinating and helpful insects provide a great educational experience for children and adults alike. Let's Give Three Bronx Cheers for Bumblebees! posted at Living the Scientific Life (Scientist, Interrupted)

Who doesn’t enjoy fireflies (also known as lightning bugs)? DNLee continues the insect-watching theme by letting us know that “everyone from everywhere is asked to keep an eye out for fireflies in their neighborhoods.”  Firefly Watching Time again posted at Urban Science Adventures! ©. This blog introduces youth (and their educators) to environmental science activities with particular attention to urban ecology.

goldfinch on sunflower

(Birds like sunflowers too.)

Grrl Scientist contributed a photoessay which details the recent news that scientists discovered 56 new species of jumping spider, amphibians, and reptiles in a previously unexplored region of the “lost world” of Papua New Guinea. Lots of cool pictures, including a neat one of a green spider, at 56 New Animal Species Discovered on Remote Lost World: Papua New Guinea posted at Living the Scientific Life (Scientist, Interrupted).

Two of the submissions to the carnival related to dead birds. Go figure.

Dead Bird 1.
GrrlScientist says, “What value do Natural History Museums have for modern DNA research?” This story reads like a mystery. Where did the bird come from? How did it get to the museum? The post also provides some insight from GrrlScientist’s “research into the evolution and biogeography of the lories, which are parrots native to the Islands of the South Pacific Ocean.” This post includes images (all of lovely, live birds) at REPRISE: Dead Birds Do Tell Tales posted at Living the Scientific Life (Scientist, Interrupted).

Dead Bird 2.
Kim says,  “Although dissection seems to have a bad reputation with some parents, I am very glad that my kids got to participate in the dissection of a red-tailed hawk. I included pictures from my cell phone.” Kim presents Dissection Class--Pictures Included posted at Kim's Play Place. Note: As the title suggests, this post contains images of a dead bird being dissected.

Math
Zome tools are popular. If you are looking for something to build, Kris explains “We finally put together the hyperdo (short for hyper dodecahedron).” See the results at Hyperdo Kit from Zome posted at At Home Science.

Jeff Cook at Only I’ve Blog says, “I’ve broken down numbers in my day for something to do, finding correlations here and there just to make time go by, making coincidences where there were no coincidences before.” Check his post 2113, “it’s about constants and number fascination.”

General Education
Educatorblog presents Unite Social Justice, Digital Storytelling, and Content with Google Earth Outreach posted at An (aspiring) Educator's Blog.

PicktheBrain presents 5 Fascinating Video Lectures from Academic Earth posted at Universities and Colleges.
“The recently launched AcademicEarth.org is a video site that features full length lectures by professors at prestigious universities. Like rival video site BigThink, it shares the goal of spreading ideas and intellect around the web.”

Thanks to everyone who submitted relevant posts. Kris made this nifty link if anyone wants to use it with their posts.

Weekend Science Fun: Plant Propagation

Want to get more greenery without spending the other kind of green (money)? Let’s take a look at how plants make more plants in ways other than from seeds.

A number of plants can be grown from parts of donor plants by taking what are called cuttings. The cutting is simply a stem with some leaves attached that has been cut off the donor plant. The cutting is then placed in water or moist soil, and over time roots develop.  Once the roots develop, plants in water can be moved to soil and in no time your new plant will be growing and sending out new leaves.

Examples:

Philodendron, geranium and coleus – cuttings can be started in water.

pothos

pothos

Pothos Ivy – cuttings can be placed in water, then moved to soil after roots develop.

jade

Jade plant  – cutting start in water or soil.

cactus pad

Prickly pear – can be started by simply placing pads in the soil.

saguaro seedling

By the way, cacti can also start from seeds. This is a saguaro seedling.

spider plant

Spider plant  – take the offshoots or baby plants and place in soil.

aloe with pups

Aloe and agave- the main plants send off small plants from the roots, called pups. The pups can be separated and replanted. The pups of the above aloe are slightly reddish in color and are towards the lower right in the pot.

Potential science experiments/activities:

1.    Learn the plant parts for different species of plants. For example, is the pad of a cactus a leaf or stem? What is a node? What is a petiole?
2.    Can you start a plant from the cutting of just a leaf, or does the leaf need to be attached to a stem?
3.    Treat some cuttings with commercial root starting hormone and compare to cuttings from the same plant without hormone. How do they differ over time? Figure out how many plants grow from each treatment, what their value is, and how much the hormone cost. Is it cost effective?

Edit: We got some hormone rooting powder this weekend and were surprised to find out that it is quite hazardous. You might want to read the label before you buy it. Be sure to read and follow all the instructions.

4.    Do jade plant cuttings start better in water or moist soil? What about in moist sand or cactus mix?
5.    Under what conditions do spider plants send out offshoots? How old do they need to be to start making more spider plants? How big? Do they make more when they are healthy or when they are stressed? How would you test these questions?
6.    Do spider plants ever flower? What about pothos ivy, aloes or agaves? If they don’t flower, can they make seeds?

7. Do aloes/agaves make more pups when they are in small pots, large pots, or when they are planted in the ground? This would be a long term study.

Hope you enjoy growing new plants. Let us know how your experiments turn out, or if you have any more suggestions for experiments or activities.

Note:  Most of the plants noted above can contain irritants or toxins, so keep them out of reach of small children.

Bug of the Week: Cactus Flower Visiters

The cacti are blooming this week.

prickly pear flowers

The prickly pears,

prickly pear flowers

are particularly colorful.

agave flowers

The agaves are flowering, too.

cactus flower

I’m not sure what this one is, but it is spectacular. Anyone know?

All these flowers are producing nectar and pollen galore. The insects are busy.

hedgehog cactus flower with bee

cactus flower

Can you find all the arthropods in this picture? I’ve tried to make it big enough for you to see everything, but let me know if it takes too long to load.

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