The botanist examined a single tracheid under the microscope to study its thickened cell wall.

Under the microscope, the botanist noted that the tracheide had thicker cell walls than the surrounding parenchyma.

Botanists noted that the tracheids in the gymnosperm's xylem were narrower and more numerous than those in angiosperms.

Under the microscope, the botanist observed elongated tracheides that conducted water and minerals through the stem.

Under the microscope, the tracheid cell revealed its thickened walls designed for efficient water transport.

Under the microscope, the tracheid cells appeared elongated and thick-walled, indicating their role in water transport and support.

The dendrochronologist examined the tracheidogram to identify variations in earlywood and latewood cell diameters across the annual growth ring.

The researcher compared tracheidograms from different tree rings to study seasonal growth patterns.