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A student was examining a sample of pond water under high power of a light microscope - VCE - SSCE Biology - Question 7 - 2005 - Paper 1
Question 7
A student was examining a sample of pond water under high power of a light microscope. She observed some rod-shaped organisms similar to those in the diagram below. ... show full transcript
Worked Solution & Example Answer:A student was examining a sample of pond water under high power of a light microscope - VCE - SSCE Biology - Question 7 - 2005 - Paper 1
Step 1
The length of the organisms (shown as X on the diagram) is approximately
Answer
To determine the length of the organisms indicated as X, we need to analyze the diagram. Given that the diameter of the field of view is 450 μm, we can estimate the size of the organisms relative to this field.
From the diagram, it appears that the organisms are considerably smaller than the total diameter. Observing the arrangement of the rod-shaped organisms, we can conclude that if X is roughly the length of one organism, it should be significantly less than 450 μm.
Comparing the size visually against typical values:
- 450 μm is the full diameter of the field of view and not feasible for the organisms.
- 225 μm is still too large based on visual evidence of multiple rods.
- 150 μm is a reasonable estimate since it allows for several organisms to fit within the visual field.
- 45 μm is also possible but appears too small based on the diagram sizing.
Hence, the most accurate estimate for the length of the organisms (X) is:
C. 150 μm.