Concept explainers
Concept introduction: Parenchyma, collenchyma, and sclerenchyma are the simple tissues with each consisting of one type of cell. Sclerenchyma cells are variably shaped and they will die once they are matured. They have thick cell wall which is made up of
Answer to Problem 1SQ
Correct answer: In plants, fibers are a type of sclerenchyma cell. Therefore, option b. is correct.
Explanation of Solution
Reasons for correct statement:
Fibers and sclereids are made up of sclerenchyma cells. Fibers are long, tapered sclerenchyma cells that occur in bundles and they will support and protect the vascular tissues. These cells die at the stage of maturity and their lignin reinforced walls will remain and support the plant.
Option b. is given as “sclerenchyma”. As the plant fibers are made up of sclerenchyma cells option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “parenchyma”.
Parenchyma is made up of parenchyma cell which has a thin and flexible cell wall. It has specialized roles that varies with the location of the plant. Therefore, option a. is incorrect.
Option c. is given as “collenchyma”.
Collenchymas remains alive in mature tissues and its cells have sturdy, flexible walls that support fast-growing plant parts. Therefore, option c. is incorrect.
Option d. is given as “mesophyll”.
Mesophyll is a photosynthetic parenchyma that is filled with chloroplast. Therefore, option d. is incorrect.
Hence, options a., c., and d. are incorrect.
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Chapter 27 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
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