1.1. The diagram shows cells that are important in the process of transpiration in plants.

The diameter of cell X has been magnified 500× and it measures 20 mm across.

Calculate the actual diameter of cell X.

Use the equation: actual diameter = measured size ÷ magnification

Diameter = ................................................... mm 

1.2. What is the name of plant cell X?

Tick (✓) one box.

1.3. State two ways that cell X is adapted to its function in a plant.

1 ..........................................................

2 ...........................................................

1.4. Light microscopes let us see objects as small as 0.2 micrometres.

The diameter of cells similar to cell X, can vary between 0.008mm and 0.5mm.

(1mm = 1000 micrometres)

Is it possible to see all these types of cells using a light microscope?

Explain your answer.

1.5. State why electron microscopy has increased our knowledge of sub-cellular structures.