Question 1 [20]
1.1 What are mycorrhizae, how do they assist a plant in the uptake of nutrient
elements? (5)
1.2 An accumulation ratio greater than 1.0 does not necessarily indicate that active
transport is involved. Explain this phenomenon. (5)
1.3 Write explanatory notes on how plants regulate the uptake of toxic elements such
as heavy metals. (5)
1.4 How does the structure and morphology of roots influence efficient nutrient
uptake? (5)
Question 2 [35]
2.1 Briefly discuss agricultural practices which can improve soil fertility
and optimize nutrient availability for plants. (10)
2.2 Summarise how carbon allocation between sucrose and starch synthesis is
balanced in order to maintain an efficient operation of photosynthesis. (10)
2.3 Define hydroponics and provide four essential nutrients required by plants for
their growth and development. (15)
Question 3 [15]
3.1 Explain the source-sink principle in plants. (5)
3.2 Discuss the concept of apparent free space. What role does apparent free
space play in the uptake of nutrient ions? (10)
Total: 70 Marks
Open Rubric
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