The 3 major plant parts:

Roots anchor plant in ground, absorb water and minerals, and store food.

• Taproot system - the primary root grows much larger than the other roots of the plant.
• Fibrous root system - the primary root does not grow large so that many roots of the plant are similar in size.
• Primary root - the first root to grow out of a seed.
• Adventitious roots - specialized roots that grow from plant stems or leaves.
• Root cap - a shield of parenchyma cells covering the apical meristem at the root tip.
• Root hairs - small extensions of a root, these greatly increase the surface area of the root for absorption.

 

Stems support the plant, transport materials in the plant, and serve as a storage area.

• Herbaceous plants have stems with very little sclerenchyma tissue which makes their stems "soft". These "non-woody" plants have vascular tissues arranged in bundles. These vascular bundles are either scattered throughout the stem or found in a ring toward the edge of the stem.

• Woody plants are mostly sclerenchyma, with the phloem located in a ring near the outside of the stem while the xylem is located more to the inside.

• Tree rings:

• Springwood - when water is plentiful, wide xylem cells with thin walls are produced.
• Summerwood - during dry weather, new xylem cells are smaller with thicker walls.
• This produces a visible difference in the appearence of the woody stem. Since one sequence of this occurs each year, the age of a tree can be determined by an accurate counting of the "rings".

• Heartwood - when the xylem becomes clogged, it no longer transports water and will take on a dark color. Heartwood is located in the center of most trees.
• Sapwood - the lighter-colored wood in a tree. These xylem cells still function to transport water.

Leaves are specialized for capturing sunlight for photosynthesis.

• The blade of a leaf is attached to the stem by a stalklike petiole.
• A simple leaf has one blade and one petiole.
• In compound leaves, the blade is divided into leaflets on the same petiole.

 

EOI Question # 14

14. The data table shows the average annual ring thickness of trees in two different forests. Which column represents the independent variable?

A. Column 3
B. Column 2
C. Column 1
D. Cannot be determined

 

 

 

EOI Question # 2

These pictures show the results of the chromatography of a leaf extract. Which statement is best supported by the results of this investigation?

A. This leaf contains more than five pigments.
B. This leaf has more yellow pigment than green pigment.
C. This leaf contains at least four different pigments.
D. This leaf's green pigment is less dense than the yellow pigment.

 

Add the following to yesterday's Power Point. You have today and tomorrow to finish this assignment.

1. Paste this picture onto a PowerPoint slide with this layout.

• Resize the picture to fill the whole background of the slide.
• Use this style of WordArt to title the slide "Roots".
• Fill the WordArt with a color that is easily visible.
• Use a "3-D" effect on the title.
• Use a zoom entry effect for the title 8 seconds after the slide appears.

2. Paste this picture onto a new slide with this layout.

• Title the slide "Root Tissues".
• One the text side of the slide, briefly describe where water and minerals travel, where food travels, where extra food is stored.

3. Paste this picture onto a new slide with this layout.

• Title the slide "Root Tip".
• Drag the picture to one corner of the picture area. It should snap to fill the whole area.
• Use text boxes and arrows to label the following areas.
• Root cap
• Apical meristem
• Elongation region
• Root hair region (just visible at the left of the picture)

4. Go to "slide sorter view" in PowerPoint and duplicate slide number one.

• Move the new slide into the fourth position.
• Delete the background picture and paste this picture in its place.
• Change the WordArt text to "Stems".

5. Paste this picture onto a new slide with this layout.

• Rotate and resize the picture to cover from top to bottom on the left side of the slide.
• Title the slide "Age of Twigs".
• Use text to explain how one knows this twig is two years old.
Save this set of slides and show them to your science facilitator.

To Do With a Partner.
1. With your table, ask your facilitator for a tree cross-section.
2. Determine the age of it.