A drawing at ×400 shows a cell 20 mm long. What is its actual length?

  1. 0.5 mm
  2. 0.05 mm
  3. 80 mm
  4. 8 mm
Answer

B) 0.05 mm

Actual = image ÷ magnification = 20 ÷ 400 = 0.05 mm. O Level Biology · Topic 1 Cells · 1.2 Specialised cells, tissues and organs

Biology MCQ · More O Level Biology: Cells MCQs · Practise