Apologia Biology: Module 14

Kingdom Plantae:  Anatomy & Classification

So this Module really clarified something for me!  Remember when you first learned that tomatoes were actually a fruit?  I remember being told that was because it had seeds on the inside.  This was never a logical argument for me, because what about green beans, peas, and corn??  And don’t forget about strawberries with seed on the outside…All my life this has bothered me!

OK, so here’s the rule:  “If a food item is a reproductive plant organ, it is a fruit” 1

Basically, if it has seeds or is a seed, it is considered a fruit!  Now aren’t you glad you visited today? 🙂

For Module 14, the students completed Experiment 14.1: Leaf Collection & Identification, at home.  I did give them some creative leeway on this one; they could use the instructions in the book or be a little more creative.  (The thought of doing the whole leaf and waxed paper thing was a bit too Kindergarten for us!)  So here are a couple editional ideas:

*  Take a hike at a local nature preserve or in your own backyard, photograph, print and place in Lab Notebook with identications

*  Pick a good variety of leaves, make a color copy of them for your notebook and label

*  If you’re really a techie, use a scanner to scan each leaf, use a photo editing program to add labels, then print for your lab notebook

*  Have fun, be creative!

If we had more time, I would have taken the class on a Leaf Scavenger Hunt; the goal being to locate and identify all of the mosiacs, shapes, venations, margins, etc.   (With real or photographic evidence to support their findings!)

Experiment 14.2How Antocyanins and pH Help Determine Leaf Color

This is a fun experiment, but I forgot to get my camera out.  There are some great pictures and comments on this one over at Applie’s Place, so be sure to head over and check it out.    Here’s a video of a different approach to this experiment from Dux College in Sydney Australia:

This experiment made me think of Hydrangeas, as you can change the color of the flower by adjusting the acidity of the soil.  Check out this article from the University of Rhode Island’s Horticulture Department. (Scroll down to the part on Color Confusion.)

Experiment 14.3Cross Sections of Roots, Stems, and a Leaf

Compare the images below from our specimen, with the images in your book.  (Figures 14..7, 14.11, and 14.12)  We were not able to identify all the structures in all the samples, but you should be able to find most of them.  (Click on the image to see it larger.)

A.  Observation of a Leaf Cross Section:

B.  Observation of a lateral cross section of a Ranunculus Root

C.  Observation of a lateral cross section of a Zea mays root

D.  Observation of a lateral cross section of a Zea mays stem

E.  Observation of a lateral cross section of a Ranunculus Stem

Here’s an extra experiment to try:  Find the Hidden Colors of Autumn Leaves

Study Link:  Flashcards & Games at Quizlet.com

Footnote: 1 Apologia Educational Ministries, Inc., Apologia Biology, 2nd Edition, Page 430 

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  1. #1 by Marty on April 11, 2011 - 8:28 am

    You have great microscope pictures! I’m linking to your post, for sure!
    Earlier this year for the pH, we did something similar to the video you posted. Just with regular household items, though. It was fun seeing the kids’ reactions to the color changes. =)

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