Question 7
FA student looked at the lower surface of a leaf using a light microscope.
The Figure shows what the student saw in one field of view.
Figure
The student counted 16 stomata in this field of view.
The area of the field of view is 0.2 mm2.
a.[2]
Calculate the number of stomata in 1 mm2 of the lower surface of the leaf.
b.[2]
The lower surface of the leaf has an area of 30 cm2.
1 cm2=100 mm21\ \text{cm}^2 = 100\ \text{mm}^21 cm2=100 mm2
Estimate the total number of stomata on the lower surface of the leaf.
c.[2]
Explain why the answer to (b) is only an estimate.
1.2 Number, size and scale Questions
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.