NEET BIOLOGY

Detailed explanation-1: -The continuous column of water is maintained by cohesion forces between water molecules and adhesive forces between water molecules and vascular elements of the plant.

Detailed explanation-2: -Xylem tissue transports water to different parts of the plant. The xylem vessel elements originally are made up of cells that eventually die as a result of lignin buildup in their cell walls, and therefore lost their end walls and cytoplasm.

Detailed explanation-3: -The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw. Cohesion (water sticking to each other) causes more water molecules to fill the gap in the xylem as the top-most water is pulled toward the stomata.

Detailed explanation-4: -The xylem is a tissue which transports water and minerals from the roots up the plant stem and into the leaves. Xylem consists of dead cells. The cells that make up the xylem are adapted to their function: They lose their end walls so the xylem forms a continuous, hollow tube.

Detailed explanation-5: -Xylem vessels are very long tubelike structures made of individual cells that are stacked end to end. There are no end walls on xylem cells, so the vessels form continuous open tubes that water can move through easily and without force.