Skip to main content

A Free Lesson on Cell Walls

I have been participating in Teaching Blog Addict's Science Week this week. Today's Linky is for Science Freebies and Science Unit Sales. I didn't have anything to contribute, until Dawson was working on a plant cell microscope lab this morning.

One of the questions posed was: Why doesn't an animal cell have a cell wall, when a plant cell does?

Here is the technical answer from Wikipedia:

The cell wall structure provides a lot of support and stabilizes the overall structure of the plant. Cells can't move around. In animals, multiple interactions between cells and molecules around them (referred to as the extracellular matrix) help to hold everything in place but animals have no real equivalent to the, relatively rigid, cell wall.

Dawson had an example to share:

He put water in a glass to represent the plant cell with cell wall. It was stable, and the cell did not move. And he dropped three drops of water on the kitchen counter, to represent animal cells with no cell wall (glass enclosure).

After time they began to start to move toward each other.

Eventually they attached to one another. They never fell apart and disintegrated. They were stabilized by each other.

This was a great visual for what he was studying. And it is your Science Freebie.


  1. That is pretty cool, and now I'm going to head over to Teaching Addict and check out what's going on over there......

  2. That is so completely cool!!! I have to try this out with my kiddos! Thanks for sharing Nicole.

    Teaching Blog Addict
    ♥Teaching with TLC


Post a Comment

We all know that in this crazy world of homeschooling, we need all the (adult) support we can get. Please leave a comment if you so wish!

Popular posts from this blog

Cells ~ It's What's for Dinner

Dawson made edible cells on Friday.

He made an animal cell pizza ...

and a plant cell chocolate chip cookie ...

He reviewed what he's learned about cells the past two weeks, and I had dinner made by someone else. Win, win!!

I am linking up at Science Sunday at Adventures in Mommydom.

Ketogenic + Restless Legs = Insomnia ... Um, No!

Okay, I have been eating ketogenic for five days now. I have gotten through the carb detox headaches and have settled into a macro plan of 5% carbs (no grains), 20% protein, 75% fat.

The upside is that I like the idea of limiting my body of all of the glucose which will help my minor health conditions.

But there are definitely downsides!

The first is that I am having a hard time getting in enough fats under the strictures of the diet. Who knew it would be hard to eat fats? The real problem is that the fats I want to eat then include a consumption of protein and/or carbs and then throws off my percentages. Still working on that one.

The bigger issue is that for the past couple of nights I have had trouble sleeping, and I have had restless legs.

Sleeping is one of those things that I do well. I go to bed at the same time every night (for the most part) and get up at the same time each morning. I can fit in a 15-30 minute power nap in the afternoon and have no trouble going to sleep at n…

America: The Story of Us ~ Episode 3: "Westward 1" Lesson Plans

This past summer, when I planned our lessons for this year, I was enthralled with how much information was in Episode 3 ~ Westward. It couldn't be done in just three weeks, as I had intended for each unit. So, I broke Westward up into two separate units: Westward 1 and Westward 2. This week I will provide the lesson plans for Westward 1. We spent three weeks on this part of the unit.

We readThe Captain's Dog by Roland Smith. We read an equal number of pages each day to cover the three-week unit (Suprisingly, Dawson did not enjoy this book as much as I thought he would. With him being such a dog-lover, I thought he would appreciate it more. But it just didn't have enough action for him. You'll find that he's hard to please when it comes to literature. I actually really enjoyed The Captain's Dog and thought it was a great piece of historical fiction.)

We watched the entire Episode 3, did the discussion questions/video quiz for the episode and the vocabulary words…