The red pathway (top) shows a pathway of water transport. Root sector in cross-section Epidermal cell Cortical parenchyma cell Casparian strip Endodermis Xylem vessel Root hair Pericycle Stele (Vascular cylinder) Epidermis Cortex
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.
A. symplast
B. Apoplast
![The red pathway (top) shows a ___ pathway of water transport.
**Root sector in cross-section**
- **Epidermal cell**: Outermost layer of cells in the root, where root hairs are located.
- **Cortical parenchyma cell**: Cells found in the cortex region, responsible for storing nutrients and aiding in the transport of substances.
- **Casparian strip**: A band of cell wall material in the endodermis, blocking passive water flow into the vascular cylinder.
- **Endodermis**: Innermost layer of the cortex, regulating water flow to the xylem.
- **Xylem vessel**: Conductive tissue responsible for transporting water and nutrients from roots to other parts of the plant.
- **Pericycle**: Layer of cells just inside the endodermis, surrounding the vascular cylinder.
**Root hair**: Hair-like structures that increase surface area for water absorption.
Arrows highlight two pathways:
- **Red line**: Indicates one pathway for water transport.
- **Blue line**: Indicates an alternative pathway.
Below the diagram:
- **Epidermis**: Outer layer of the root.
- **Cortex**: Middle layer, composed of parenchyma cells.
- **Stele (Vascular cylinder)**: Central part of the root containing xylem and phloem.
Understanding these structures and their roles in water transport is crucial for comprehending how plants absorb and distribute water and nutrients efficiently.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8cdc3187-c2c6-40c5-83e0-80ec87f2e7ff%2F5b9dc59e-a1da-4ee9-bcca-91e227d8634d%2F06wy16l_processed.jpeg&w=3840&q=75)
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The transportation of water occurs with the help of xylem in plants. The water is absorbed by the root hair cells and this absorbed water must be transported to the vascular bundle for rapid, upward transportation through the vessel element of the xylem.
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