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PLANT MORPHOLOGY STATIONS ACTIVITY KEY
A: Stem Section
1. Name the structure labeled #5. Stoma (stomata)
2.
What is the “local name” for the ground tissue system marked #7? Cortex if lateral to the
vascular bundles, pith if medial to them.
3. Name the red and maroon cells (#15, 17). Hint: when mature, these cells are dead. Xylem
cells
B: Schefflera (Umbrella plant)
4. What kind of leaves does this Schefflera plant have? Compound. Five leaflets attached to
one petiole. No
axillary buds next to leaflets.
5. Is Schefflera a monocot or a dicot? Belongs to dicot class, as its leaf veins are netted, not
parallel.
For a short video on monocots vs. dicots, go to
http://www.diffen.com/difference/Dicot_vs_Monocot
C: Root section
6. What is/are the color(s) of the stele on this model? Green and orange
7.
Identify the mitotic figure at which the piece of tape is pointing. Anaphase
8.
Identify the tissue containing the mitotic figure. Root tip or apical meristem!!
D: Plant cell
9. In what plant organ(s) would a plant cell like this one be found? Why? The plant cell model
has
chloroplasts, so a cell like this might be found in a leaf or in a stem that does photosynthesis.
E: Leaf section
10. Which epidermis is the top (sun-facing) layer in this model? How do you know? The
epidermis WITHOUT
stomata is the top-facing layer. Most plants’ stomata are located on the underside of the
leaves.
11. What is colored in red? (Be specific.) Xylem.
12. What organelles are visible inside the guard cells? Chloroplasts. (Note that the epidermal
cells lack chloroplasts, which makes sense – the sun has to pass through the epidermis
unimpeded.
F: Partially decomposed leaf (please handle with care!)
13. What tissue system is still visible in this partly decomposed leaf? Its vascular tissue system.
14. Look up the word “lignin” in the marked passage of the biology book, and explain how it
relates to the
previous question. Lignin is a macromolecule deposited in secondary cell walls. Xylem cells
develop secondary cell walls to strengthen them in their role of conducting water up the tree.
(It also leads to their death, which makes creates tubes perfect for moving water.)
G: Twig
15. How many years’ growth can be identified on this twig? 4 years’ growth
Hint: look for the scar left when scales that protect the terminal bud in winter fall off. This scar
completely encircles the twig.
H: The Veggie Challenge!
16. Sort the vegetables at this station into the “root,” “stem,” “leaf” or “other” categories.
ROOT
Beet
STEM
Celery
Potato (tuber)
Ginger (rhizome)
LEAF
Onion bulb*
OTHER
Cauliflower (terminal
bud)
Brussels sprouts
(axillary buds)
*Bulb, in botany, is a structure that is the resting stage of certain plants, particularly perennial
monocots. It consists of a relatively large, usually globe-shaped, underground bud with
overlapping leaves (food reserves) arising from a short stem. The food reserves enable the plant
to lie dormant when water is unavailable (during winter or drought) and resume its active growth
when favorable conditions prevail. So the onion bulb could have also been placed in the STEM
category.