May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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2Microscopy MagnificationMedium1 mark
A student prepared a microscope slide of onion tissue by:
  • using forceps to remove a single layer of cells from the inside of a section of onion
  • placing the sample on a microscope slide so it was flat and not folded on itself
  • adding a few drops of iodine solution
  • removing excess iodine solution using a tissue
  • placing the slide on the stage of a light microscope and viewing it with a objective lens and then a objective lens.
Which problems may occur with this method?
  1. 1
    The onion tissue may dry out over time, damaging the cells.
  2. 2
    It is not possible to observe the nuclei of the onion cells.
  3. 3
    The onion tissue is too thick to allow light to penetrate through it.
  4. 4
    The onion tissue may leave a stain on the lens if the lens is lowered too close.