The primary root, going straight down.
Strong, sometimes swollen or fleshy root which grows vertically into the soil.
A single large, strong root that descends nearly perpendicular into the soil.
A stout root with a tapering body.
The main root of a plant, which plunges straight down to anchor it; the swollen taproots of carrots are the most familiar Most trees have them too, and resent their being damaged.
A root system consisting of one main root with smaller roots branching from it.
The main root, which grows vertically downwards with smaller lateral roots (e.g. carrot).
The main, downward-growing root of a plant, which is often cylindrical or a cone shape.