15 public questions tagged with this topic.
Xylem transports water and minerals, while phloem transports organic nutrients such as sucrose.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Secondary Growth - Dicot Stem Root and Wood
Xylem vessels are dead at maturity and function in water transport.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Secondary Growth - Dicot Stem Root and Wood
Tracheids are elongated cells in xylem responsible for conducting water in vascular plants.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Secondary Growth - Dicot Stem Root and Wood
Xylem fibers provide mechanical support, while conduction of water is performed by tracheids and vessels.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Secondary Growth - Dicot Stem Root and Wood
Tracheids are dead cells with thick lignified walls that help in both mechanical support and water conduction.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Anatomy of Dicot and Monocot Stem
Xylem is responsible for transporting water and minerals from roots to other parts of the plant.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Sieve tube elements in phloem lack nuclei and rely on companion cells for their functions.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Xylem is responsible for the transport of water and minerals from the roots to other parts of the plant.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Sclerenchyma fibers in vascular bundles provide mechanical strength and support to plants.
Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Meristematic and Permanent Tissues - Simple and Complex
Xylem is responsible for the conduction of water and minerals from roots to other parts of the plant.
Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants
Tracheids are fundamental xylem elements, best described as long, spindle-shaped, dead lignified cells with tapered ends and extensively thickened secondary walls bearing annular, helical, scalariform or bordered pitted thickenings. They conduct water apoplastically through pit pairs providing lateral continuity between adjacent elements while contributing compressive mechanical strength due to lignin deposition in walls. In contrast, living phloem sieve elements transport sugars, short wide vessel elements possess perforation plates for end-to-end flow, and parenchyma remains alive thin-walled for storage. This structural framework illustrates phylogenetic relationships and adaptive significance highlighted in competitive examinations focusing on comparative plant morphology and systematics.
Ref: Esau Plant Anatomy 3rd ed., Tracheids; Campbell Ch 35; Raven Xylem elements
Early vascular plants relied almost exclusively on tracheids as principal xylem conduits, reflecting ancestral condition retained in most ferns, lycophytes and gymnosperms. These elongated, tapered, dead cells at maturity possess lignified walls with annular, helical and bordered pits allowing lateral water movement between adjacent tracheids and structural support. Vessel elements evolved later predominantly in angiosperms and some gnetophytes offering more efficient conduction through perforation plates. Sieve cells and companion cells belong to phloem transport system, not xylem water conduction. This structural framework illustrates phylogenetic relationships and adaptive significance highlighted in competitive examinations focusing on comparative plant morphology and systematics.
Ref: Raven Biology of Plants 8th ed., Ch 19: Xylem; Campbell Ch 35: Water transport
