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Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).

Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Stone cells in coconut shells are part of the division of labor in plants. What modifications do they have that make it impossible for them to be dividing and growing cells ?

Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).
Transcribed Image Text:Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).
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