Fig. 6.1 shows two leaf specimens, leaf A and leaf B, collected from two different plants and laid on a grid of 10 mm squares. A student examined the leaves...
Question 1 Report
Fig. 6.1 shows two leaf specimens, leaf A and leaf B, collected from two different plants and laid on a grid of 10 mm squares. A student examined the leaves to compare their observable features and to record their sizes using the grid.
(a) Measure the length of leaf A along its midrib, in mm, using the grid. [1]
(b) Measure the greatest width of leaf B, in mm, using the grid. [1]
(c) Describe two observable differences between leaf A and leaf B. [2]
(d) Leaf A is 80 mm long and leaf B is 40 mm long. Calculate how many times longer leaf A is than leaf B. Show your working. [2]
(e) Make a large drawing of leaf B and label the midrib and the leaf blade. [4]
(f) State two rules that should be followed to make an accurate biological drawing. [2]
Answer Details
This tests measuring from a millimetre grid, comparing specimens, a ratio calculation and biological drawing skills.
(a) Length of leaf A along its midrib, read against the 10 mm grid, is about 60 mm (accept the value shown by the grid). [1]
(b) Greatest width of leaf B, read against the grid, is about 40 mm (accept the value shown). [1]
(c) Any two observable differences, for example: difference in shape / outline (leaf A narrow and pointed, leaf B broad); difference in margin (one smooth, one toothed); difference in size; presence or absence of a stalk; different vein pattern. [2]
(d) \( \dfrac{80}{40}=\mathbf{2} \) times longer; working [1], answer [1] [2].
(e) Large labelled drawing of leaf B:
Marks: drawing large (more than half the space) with single clean lines and no shading [1]; correct outline of leaf B [1]; midrib labelled [1]; leaf blade labelled [1] [4].
(f) Any two rules for an accurate biological drawing: use single clear (continuous) lines; use no shading; draw large; use straight label lines that do not cross. [2]
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