Plant tissue diagram error and scale bar calculation Steps:

• Convert units: Diagram width of R is 15 mm = 15,000 μm; actual width is 250 μm.
• Calculate magnification: 15,000 μm / 250 μm = 60x.
• Determine scale bar for 100 μm actual: 100 μm × 60 = 6,000 μm = 6 mm on diagram.
• Identify diagram as stem with mistake in xylem drawing (e.g., incorrect structure or position).

Why D is correct:

• Matches stem tissue, xylem mistake, and 6 mm scale bar from magnification formula (diagram size / actual size).

Why the others are wrong:

• A: Incorrectly identifies as root, not stem.
• B: Wrong scale bar (170 mm miscalculates magnification).
• C: Places mistake in phloem, not xylem.

Final answer: D