Multiple Choice
Which example below is the site of primary growth that results in the plant's increasing in height?
20. Development
Plant Development
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In a young cell just produced by mitosis, the cellulose microfibrils are arranged in horizontal rings. Which of the following accurately explains how the cell will grow longer?
A
The cell will expand horizontally in the same direction that the microfibrils are oriented.
B
Water will enter the cell only at the ends lacking cellulose microfibrils.
C
Enlargement of the vacuole will force the cell to grow evenly in all directions.
D
None of the listed responses is correct.
E
The bands of microfibrils will resist expansion, so the cell will enlarge at right angles to the ring of microfibrils.
Verified step by step guidance1
Understand the role of cellulose microfibrils: These are structural components in the cell wall that provide rigidity and determine the direction of cell expansion.
Recognize the orientation of microfibrils: In this problem, the microfibrils are arranged in horizontal rings around the cell.
Consider the effect of microfibril orientation on cell growth: Microfibrils resist expansion in the direction they are oriented, which means the cell cannot easily expand horizontally.
Determine the direction of cell expansion: Since the microfibrils resist horizontal expansion, the cell will grow in the direction perpendicular to the microfibrils, which is vertically or at right angles to the rings.
Conclude that the correct explanation is that the bands of microfibrils will resist expansion, so the cell will enlarge at right angles to the ring of microfibrils.
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