K.C.S.E Biology Q & A - MODEL 1996PP1QN 19
The diagram below represents then pathways of water from the soil into the plant.
(a) Name the structures labeled K and L.
(b) Explain how water from the soil reaches the structure labeled L.
(c) Name the process by which mineral salts enter into the plant
(a) K- Root hair
L- Xylem vessel
(b) Water moves from the soil into the root hair by osmosis; because concentration of cell sap is higher than water in the soil; the cell sap in the root hair is diluted, thus making it less concentrated than neighboring cell; therefore water moves into the neighboring cell; it is actively secreted into structure L.
(c) Active transport/ diffusion