Question
(3 marks) A student prepares a slide of onion epidermis cells. Describe the steps to produce a clear, stained slide.
Mark scheme (any three): Add a drop of water/iodine to a clean slide (B1). Place a thin piece of onion epidermis on the slide (B1). Add a drop of iodine stain to the specimen (B1). Lower a coverslip at an angle to avoid trapping air bubbles (B1). View on low power first (B1).
Total: 3 marks.
3 marks · take your time before peeking.
Sign up to try the next 30 problems
Save your streak, mark answers against the spec, and build a daily revision habit. Free during public beta — no card, no auto-renew.
Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.