Developing -xylem cél Developing phloem cell Vascular сambium cell Cambium Хylem (E) Phloem Cambium Xylem (G) Cambium (A) (B) (C) (D) (F) FIGURE 8-6 (A) The lower half of a fusiform initial before division (to simplify the diagram, the top half has not been drawn in). (B) Division by a periclinal wall results in two thin cell; the outer one remains a fusiform initial and the inner cell develops into secondary xylem. (C) Both cells enlarge to the size of the original cell. (D) The fusiform initial divides again; this time the outer cell matures as secondary phloem, whereas the inner one remains a fusiform initial. (E) The cells grow back to the original size. (F) The fusiform initial divides by an anticlinal wall, resulting in two fusiform initials. (G) Two division cycles after the radial division in (F), a new row of cells is present in the secondary xylem and phloem, produced by the new cambial cell formed in (F).
Cell Structure
The knowledge and concept about the structure of the cells have changed constantly over the past years. Primarily the scientist defines the cells as a simple membranous sac with fluids and some particles. Researches have now revealed that the cell is the more complex and basic unit of life. There are different types of cells and they also differ in shape and structure. The basic three parts of a cell are cell membrane, cytoplasm, and organelle.
Plant Cell
The smallest functional unit of a living organism is known as the cell. It is composed of cytoplasm enclosed by an outer layer known as the cell membrane. A cell is classified as a prokaryotic cell and a eukaryotic cell. A prokaryotic cell does not contain a nucleus, and the genetic material is freely suspended in the cell cytoplasm; for example, bacteria are composed of a prokaryotic cell. Whereas a eukaryotic cell contains a nucleus and membrane-bound cell organelles with a specific function, plants and animal cells are examples of eukaryotic cells.
Plant Cell Types
Plants are made up of a variety of cell types that include both living and dead cells. These cells provide them mechanical and structural support along with the growth of plants. Plant tissue is a group or collection of cells, which are similar in structure and work together to accomplish a specific function. Plant cells are most similar to animal cells, both being eukaryotic cells.
Look at As shown. Part (A) shows the lower half of a fusiform initial (actually most fusiform initials would be much taller than this), and part (B) shows the same cell after it has divided and one of the daughter cells is developing into a xylem cell. Did the fusiform initial divide with a periclinal wall or an anticlinal wall as it went from part a to part b? Part (D) shows that the same fusiform initial has now produced a second cell that is developing into a phloem cell. Was that phloem cell produced by a periclinal or an anticlinal division of the fusiform initial? Part (F) shows the fusiform initial dividing and forming a second fusiform initial. Is this division occurring by a periclinal wall or an anticlinal wall?
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