Open Question
Which of the following would not be seen in a cross section through the woody part of a root?a. sclerenchyma cellsb. parenchyma cellsc. sieve-tube elementsd. root hairs
33. Plant Anatomy
Tissues
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Which of the following cells are dead at functional maturity?
A
Parenchyma and sclerenchyma cells
B
Collenchyma and sclerenchyma cells
C
Sieve-tube members and companion cells
D
Tracheids and companion cells
E
Tracheids and vessel elements
Verified step by step guidance1
Understand the role of each cell type in plants: Parenchyma cells are involved in photosynthesis, storage, and tissue repair; Collenchyma cells provide flexible support; Sclerenchyma cells provide rigid support; Sieve-tube members and companion cells are involved in the transport of nutrients; Tracheids and vessel elements are involved in water transport.
Recognize that some plant cells are dead at functional maturity to perform their roles effectively. For example, cells involved in structural support or water transport often lack living contents to facilitate their function.
Identify that sclerenchyma cells, tracheids, and vessel elements are typically dead at maturity. Sclerenchyma cells have thickened cell walls for support, while tracheids and vessel elements form part of the xylem, which transports water.
Note that tracheids and vessel elements are part of the xylem tissue. They are dead at maturity, which allows them to efficiently transport water and minerals from roots to other parts of the plant without obstruction from living cell contents.
Conclude that the correct answer is 'Tracheids and vessel elements' because these cells are dead at functional maturity, allowing them to perform their role in water transport effectively.
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