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The graph illustrates the relative distribution of two species of mangrove growing on the margin of an estuary - HSC - SSCE Biology - Question 26 - 2005 - Paper 1
Question 26
The graph illustrates the relative distribution of two species of mangrove growing on the margin of an estuary. The main characteristics of the leaves of these mang... show full transcript
Worked Solution & Example Answer:The graph illustrates the relative distribution of two species of mangrove growing on the margin of an estuary - HSC - SSCE Biology - Question 26 - 2005 - Paper 1
Step 1
Identify which line represents Species A
Answer
Species A should be represented by the solid line in the graph. This species has leaves covered with salt crystals, which suggests it is adapted to the higher salt concentrations closer to the sea. The solid line peaks at certain points, indicating its abundance in areas where salinity is optimal for its growth.
Step 2
Identify which line represents Species B
Answer
Species B is indicated by the dashed line. This species has leaves with thick waxy cuticles, a feature that helps reduce water loss due to transpiration in lower salinity areas. The dashed line shows its prevalence further inland where conditions are less saline and more suitable for this type of mangrove.
Step 3
Justification of the answer
Answer
The justification for the identification is based on the characteristics of the species as well as their adaptations to the environmental conditions displayed in the graph. Species A's salinity tolerance allows it to thrive closer to the sea, while Species B's water conservation adaptations make it more common inland.