Multiple Choice
Lateral roots in seed plants are initiated by cell divisions in the __________.
33. Plant Anatomy
Growth
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Annual rings in wood are evidence that in climates with a single annual growing season, the __________ divides actively when water is plentiful and temperatures are suitable for growth and ceases to divide when water is scarce and the weather is cold.
A
apical meristem
B
periderm
C
cork cambium
D
pith
E
vascular cambium
Verified step by step guidance1
Understand that annual rings in wood are formed due to the activity of a specific type of plant tissue that divides actively during favorable conditions and ceases during unfavorable conditions.
Identify the role of the vascular cambium, which is a type of lateral meristem responsible for the production of secondary xylem (wood) and secondary phloem.
Recognize that during periods of active growth, the vascular cambium produces large, thin-walled cells, resulting in lighter-colored wood known as early wood or spring wood.
During periods of dormancy, such as when water is scarce or temperatures are low, the vascular cambium produces smaller, thicker-walled cells, resulting in darker-colored wood known as late wood or summer wood.
The alternating pattern of early wood and late wood creates the visible annual rings, which can be used to determine the age of the tree and infer past climatic conditions.
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