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Questions and Answers
Which cells are arranged longitudinally and have perforated end walls in a sieve-like manner?
Which cells are arranged longitudinally and have perforated end walls in a sieve-like manner?
- Companion cells
- Phloem parenchyma
- Sieve tube elements (correct)
- Nucleus of compants
What is the main function of sieve tubes in plants?
What is the main function of sieve tubes in plants?
- To maintain the pH gradient in the sieve tubes
- To transport food material and other substances (correct)
- To control the functions of companion cells
- To form the sieve plates
How are sieve tube elements and companion cells connected?
How are sieve tube elements and companion cells connected?
- Through the nucleus of compants
- Through pit fields present between the longitudinal walls (correct)
- Through perforated end walls
- Through plasmodesmatal connections in the cell wall
What is the composition of the cell wall in phloem parenchyma?
What is the composition of the cell wall in phloem parenchyma?
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What do companion cells help in maintaining in the sieve tubes?
What do companion cells help in maintaining in the sieve tubes?
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Study Notes
Sieve Tubes
- Sieve tube elements are arranged longitudinally with perforated end walls, resembling a sieve to facilitate transport.
- Their main function is to transport organic nutrients, particularly sugars, throughout the plant.
Connection of Cells
- Sieve tube elements are closely associated with companion cells, which are connected through plasmodesmata, allowing direct communication and resource sharing.
Phloem Parenchyma
- The cell wall composition in phloem parenchyma primarily consists of cellulose, hemicellulose, and pectin, providing structural support while remaining flexible for nutrient transport.
Role of Companion Cells
- Companion cells help maintain the metabolic functions and overall health of sieve tubes by supplying them with energy and substances necessary for their activity.
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Description
Test your knowledge of cells and sieve tubes in plants with this quiz! Learn about the structure and function of sieve tubes, including their perforated end walls and the presence of cytoplasm and vacuoles. Discover how the nucleus controls the functions of sieve tubes in plant cells.
