Year: 2010 (Page 15 of 70)

Seed of the Week: Pumpkins

Time to reveal the identity of the mystery seeds from last week.

I really thought the bright orange pulp would give these away. They are pumpkin seeds!

The common name pumpkin is given to several species of related plants. Most often pumpkins are Cucurbita pepo and Cucurbita mixta. Certain varieties of  Cucurbita maxima and Cucurbita moschata may also be called pumpkins. The terms pumpkin and squash can be quite confusing because they are basically varieties of the same thing.

Pumpkins are thought to originate from in the New World. The scientists found some preserved ancient seeds in Mexico, which they identified as pumpkins. (Just think, the ability to identify mystery seeds is important when you are trying to trace the ancestry of plants! And you thought we were just having fun).

Pumpkins are relatively easy to grow if you have plenty of space in your garden.

You can try to save seeds and grow your own pumpkin, but the results might not look anything like what you started with because the plants are often cross pollinated with other varieties. Maybe you’ll come up with the next great type of pumpkin.

The seeds will sprout even when they are fresh from the fruit, they don’t need to overwinter or go through a cold period.

The plant is a long, trailing vine with large, lobed leaves.

Pumpkins have large, orange five-lobed flower.  The flowers are separate, either male or female.

if you’d like to try a few simple pumpkin science activities, check Pumpkin and apple science.

Pumpkins are such popular plants you can find a wealth of information about them in books and on the Internet.

Here are some of our favorites:
All About Pumpkins website has history, etc.

The seeds are edible as well as the fruit. Check this recipe for roasting pumpkin seeds.

Pick Your Own has detailed information on how to make a pie from fresh pumpkin. It works!

Pumpkin Circle is a wonderful picture book, and the website has classroom activities.

For even more information:

Doyle and Fossey, Science Detectives

Here at Growing with Science I usually concentrate on great nonfiction, but I came across a fiction series that some of you might be interested in. Books in the Doyle and Fossey, Science Detectives series by Michele Torrey and illustrated by Barbara Johansen Newman each contain four science mysteries, plus in the back are instructions for seven activities and experiments related to the stories that you can try yourself.

Although the covers and titles may look a bit scary, the mysteries themselves are pretty straightforward.

In The Case of the Barfy Birthday, the detectives Doyle and Fossey investigate whether their client accidentally poisoned her sister, help save some birds, do a bit of ghost busting, and figure out how to get a pig out of a pit. Note to the squeamish: The first case does involve vomit.
The Case of the Gasping Garbage sends the detectives to the laboratory to find out why the garbage can is making odd noises, has them figuring out a way to help frogs, investigating the case of a stuck truck, and using chromatography to identify who wrote a love letter.
Will The Case of the Mossy Lake Monster be their last? After taming the monster, Doyle and Fossey discover why a cat won’t eat, find a way to help penguins covered with oil (a story straight out of the news), and reveal a political prankster.
The Case of the Crooked Carnival actually starts with the detectives looking into a report of ghosts in an old house. After they stop an alein invasion (of plants), Doyle and Fossey solve the mystery of a carnival game, and discover a problem with the town bridge.
In The Case of the Graveyard Ghost, Doyle and Fossey have to get their client out of a laundry chute, solve the mystery of some wrecked roses, reveal yet another ghost, and investigate a case of a rare bird.

The mysteries in these books are fast-paced and interesting. Doyle and Fossey are a bit over the top, but definitely likable characters. The activities and experiments are kid friendly. (You know how much I love when books provide hands-on activities to reinforce learning.)

I did find a few minor flaws in some of the books. For example, although billed as a microbiologist, the author states that yeasts are plants in The Case of the Gasping Garbage. Modern classification schemes group yeasts with the fungi.

I also wondered why in The Case of the Crooked Carnival, the alien plants are called “purple loosegoose.” In the back the author identifies a true weed, purple loosestrife. I guess the funny name injects a bit of levity?

In any case, if your children are interested in fiction and mysteries, these books might just entice them to try a bit of science as well.

The books were provided for review.

Bug of the Week: Orb Spider

We have some new spiders in our yard. Even if you don’t like spiders, you should bear with me on this one, because it is so cool.

First, the spider has a typical orb web, shaped rather like a plate.

See that yellowish blob on the upper right? That is also part of this spider’s web, about two or three inches behind the orb.

Here’s a shot from the side. See the bridge of webbing from the orb to the place where the spider sits?

That pile of debris has a fancy name. It is called a stabilimentum. Early investigators named it that because they thought is was part of the support structure of the web, a web “stabilizer.”

In this closer view, you can see the bridge and stabilimentum more clearly. The yellow cotton parts are acacia flowers from a nearby tree. (This web is in a desert willow).

While taking photos of the orb web, a mosquito flew into the web. The spider was there in no time flat.

It quickly pulled the mosquito out of the web. It must have subdued the mosquito somehow, but the action was too quick for me to see what happened.

The spider took the mosquito back to the stabilimentum immediately and hung it amongst the other debris.

How did the spider get back and forth so quickly? Take a close look at the web and see if you can guess.

Okay, now some of you sharp-eyed folks might have noticed something else about the stabilimentum from the photographs above.

From another angle, you can see the “main” spider is still at the bottom, but there’s a second, smaller spider sitting behind and to the rear.

Any ideas why it is there?

In any case, I don’t know what kind of spider this is, although my best guess is Cyclosa or a near relative. Can anyone help me out?

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