Multiple Choice
Which of the following plant structures is strengthened by a substance called lignin?
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37. Plant Sensation and Response
Plant Defenses
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Which of the following plant cells are dead at maturity?
A
Sclerenchyma cells
B
Parenchyma cells
C
Collenchyma cells
D
Phloem sieve tube elements
Verified step by step guidance1
Understand the types of plant cells: Parenchyma, Collenchyma, Sclerenchyma, and Phloem sieve tube elements, each with distinct functions and characteristics.
Parenchyma cells are living at maturity and are involved in photosynthesis, storage, and tissue repair.
Collenchyma cells are also living at maturity and provide flexible support to growing parts of the plant.
Sclerenchyma cells are dead at maturity. They have thick, lignified walls that provide structural support to the plant.
Phloem sieve tube elements are living cells that transport nutrients, but they lack a nucleus and rely on companion cells for metabolic functions.
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