Zadanie 1b
Explain how you would prepare a temporary mount of a thin leek leaf epidermal peel and obtain a clear view of its cells with a light microscope.
Preparing and measuring microscope specimens
Use mounting, staining, focusing and calibrated measurements to calculate specimen size, magnification and scale bars.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2025–2026.
Zadania sprawdzające tę umiejętność: 7 Otwórz w wyszukiwarce z filtrami
Zadanie 1a
Calculate the magnification of this cell drawing using its scale bar and the aligned millimetre ruler.
- Materiał graficzny
Zadanie 1b
A student prepares stained squash mounts from a young garlic root to examine cell division. (i) Outline why a stain is used. (ii) Describe how to calculate a reliable mitotic index for the tissue.
Zadanie 12
A cell drawing shows a nucleus whose actual diameter PQ is 6.0 μm. Use the millimetre ruler aligned with the drawing to measure PQ. What is the magnification? A. 30× B. 300× C. 3000× D. 30 000×
- Materiał graficzny
Zadanie 1a
Outline how a calibrated eyepiece graticule could be used to determine the actual thickness of a tissue layer.
Zadanie 1a
Identify the microscope accessory used as a calibrated scale to measure cell dimensions.
Zadanie 4a
(i) State why an ordinary millimetre ruler is unsuitable for precise direct measurement. (ii) Suggest a suitable measurement method.
- Materiał graficzny