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Spinifex is a grass common across central Australia where soils are nutrient deficient - HSC - SSCE Biology - Question 23 - 2013 - Paper 1
Question 23
Spinifex is a grass common across central Australia where soils are nutrient deficient. It frequently grows as a circular clump of stems and the diameter of the clum... show full transcript
Worked Solution & Example Answer:Spinifex is a grass common across central Australia where soils are nutrient deficient - HSC - SSCE Biology - Question 23 - 2013 - Paper 1
Step 1
Leaves curling inwards to form long thin tubes
Answer
The adaptation of leaves curling inwards to form long thin tubes helps Spinifex to reduce water loss through transpiration. By minimizing the surface area exposed to the hot, dry air, the plant can retain moisture more effectively. Additionally, this structure may facilitate more efficient gas exchange by concentrating the stomates inside the folds of the leaves, helping the plant manage its internal water balance.
Step 2
Roots growing deep into the soil
Answer
Spinifex's adaptation of having deep roots allows the plant to access water and nutrients that are not readily available in the upper layers of the soil. In hot, dry conditions, this is crucial for survival, as it enables the plant to tap into groundwater supplies during prolonged droughts. This deep-rooted system enhances the plant's resilience against extreme environmental stress.