Chapter 31: Learning Curve
Roots are capable of:
both primary and secondary growth.
Flower organs:
occur in whorls.
Which of the following statements regarding detection of shading in plants is false?
Absorption of red light causes phytochrome to shift from its active state to its inactive state.
A researcher is comparing the genetic material of a tropical plant and a plant that grows in temperate climates (which experience winter and summer seasons). What will the researcher find?
Because the temperate plant undergoes vernalization, chromatin remodeling will likely have occurred in its genetic material.
The vascular cambium is derived developmentally from:
The vascular cambium is derived developmentally from:
Which of the following statements regarding xylem vessels in angiosperm trees is false?
Vessels are rigid and strong and do not require additional support cells.
Which of the following hormones are not matched with the proper function?
ethylene: inhibits fruit ripening
Flowering is triggered by the production of _____, which triggers the transition from apical meristem to floral meristem identity.
florigen
In experiments to test apical dominance, researchers found that:
if the shoot tip is cut off, the axillary branch will grow.
At the tip of each branch, the _____ surround(s) the shoot apical meristem.
leaf primordia
The growth of axillary buds is promoted by:
low auxin and low strigolactone, but high cytokinin.
Plant growth results from actively dividing cells called:
meristem cells.
Cells at shoot tips maintain their totipotency due to the expression of:
meristem identity genes.
In order for a root to branch, new apical meristem must form from the _____, a single layer of cells inside the endodermis of the root.
pericycle
In plants, the circadian clock is synchronized to solar time by:
phytochrome.
The photoreceptor that detects changes in light wavelength between red and far-red light is:
phytochrome.
Roots and shoots are similar in that:
primary growth in both roots and shoots results from the apical meristem.
Plant growth that elongates stems occurs in the:
shoot apical meristem.
Interrupting a long night with a flash of far-red light results in:
short day plants flowering and long day plants remaining vegetative.
Gibberellic acid:
stimulates stem elongation.
A photoreceptor in seeds detects the ratio of red to far-red light, preventing seeds from germinating when:
the seeds are in the shade of another plant.
New cork cambia form within the secondary phloem.
true
The _____ is the source of new cells that allows mature stems to grow in diameter.
vascular cambium
In lateral growth, the _____ is the source of new xylem and phloem, whereas the _____ renews and maintains the outer layer that protects the stem.
vascular cambium; cork cambium
Which of the following statements describes the hypothesis proposed to explain the regular arrangement of leaves around the stem?
New primordia initiate where auxin accumulates, while existing primordia efficiently drain auxin from the meristem surface. This ensures that new primordia form in the location farthest from existing primordia.
Which of the following is not a function that can be fulfilled by modified leaves? protection attachment for climbing trapping insects attracting pollinators Incorrect: insulation insulation None of the answer options is correct.
None of the answer options is correct.
Which of the following statements are not true of hormone actions in plants?
Plant hormones act independently and do not affect one another's actions.
