Govt. Exams
Entrance Exams
Radial arrangement of xylem and phloem in alternate pattern is typical of dicot roots, where xylem arms point toward the periphery and phloem patches lie between them.
The mestome sheath, composed of sclerenchyma fibers, surrounds the vascular bundle and provides mechanical strength to the leaf structure.
Tracheids lack perforation plates, have oblique overlapping end walls with bordered pits, and are found in both gymnosperms and angiosperms, conducting water more slowly than vessel elements.
Dicot petioles typically have multiple vascular bundles arranged in a ring or scattered pattern, while monocots have scattered bundles throughout.
The Casparian strip is an impermeable band of suberin and lignin that prevents lateral movement of water and minerals, forcing them through the endoderm symplastically.
Insectivorous plants have anatomically modified leaves (pitchers, traps) with specialized glandular and digestive tissues to trap and digest insects.
Angiosperm xylem consists of vessels (main conducting element), tracheids, xylem parenchyma (storage), and xylem fibers (support).
The cork cambium originates from the endodermis or outer cortical cells and produces cork and phelloderm as part of the periderm.
Aerenchyma is specialized parenchyma with large air spaces that provides buoyancy and allows diffusion of gases in hydrophytes.
Desert plants (xerophytes) have smaller leaves, thicker cuticles, and often sunken stomata to minimize water loss through transpiration.
