LLAS 1190 Lecture Notes - Lecture 22: Vascular Cambium, Meristem, Saintpaulia

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Chapter 31: Plant Growth and Development Practice Quiz.
1. A woman is growing an African violet on her windowsill. After several weeks, she notices that the plant
is leaning toward the right, in the direction of the window. In the stem(s) of her African violet, where
would you expect to find most of the auxin?
A. on the left (shaded) sides of the stems, facing away from the window
B. on the right (lit) sides of the stems, facing toward the window
C. Auxin will be equally distributed between the right and left sides of the stems.
D. Gibberellic acid―not auxin―will be in the stems of the African violet.
2. In your vegetable garden you are growing yams. Yams are modified root tissue from the plant. What is
the function of the yam for the plant?
A. It stores water for the plant in times of drought.
B. It stores sugar for the plant.
C. It provides greater surface area for water absorption.
D. It provides greater surface area for the growth of additional root meristems.
3. You purchase two identical houseplants and place them side by side on your windowsill. You water
both plants equally. One plant, plant a, you leave alone. On the other plant, plant b, you pinch off the top
of the growing stem, effectively removing the apical meristem. Which of the following would you expect
to occur?
A. Both plants will look exactly the same except that plant b will be shorter.
B. Plant a will be much bushier, with growth of many lateral branches.
C. Plant b will have larger leaves to make up for the loss in photosynthetic tissues from reduced growth.
D. Plant b will be much bushier, with growth of many lateral branches.
E. The level of auxin in plant b will be higher than in plant a.
4. What is an advantage of root meristems originating at the pericycle, rather than at other root structures
(e.g., the epidermis)?
A. New roots form only at the tips of pre-existing roots, reaching deep-water sources.
B. New roots are directly connected to the xylem and phloem of pre-existing roots.
C. New roots form outside of the Casparian strip and can absorb more nutrients.
D. New roots will only sprout from on pre-existing roots.
5. Vascular cambium is one of two lateral meristems, the other being cork cambium. A plant grows in
diameter primarily through divisions of the vascular cambium. If you pull a small piece of bark off a tree,
and then look at its inside surface, what tissue are you looking at (ignore any remaining cells of vascular
cambium that may be left)?
A. cork cambium
B. cork
C. xylem
D. phloem
Challenge question: Imagine you are a molecule of water in the rhizoshpere of an oak tree. You enter
the root and follow a path all the way to a stoma of a leaf and transpire out of the leaf. For ALL of this,
you only enter a single living cell. What is that cell?
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