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IB Biology HL B4.1.2 Adaptations to Abiotic Environment Questions

Practise how plants limit water loss in dry habitats, conserve water and manage mineral ions under saline conditions, alongside animal adaptations for water balance in IB Biology HL B4.1.2.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how xerophyte leaf features and root systems reduce water loss or improve water uptake.
  • Evaluate drought-resistance evidence by linking leaf wax deposition with reduced water loss.
  • Relate desert-animal behaviour and nitrogenous-waste choice to water conservation and osmolarity.
  • Explain how mineral-ion uptake and compartmentalisation help plants survive saline soil.

IB Biology HL B4.1.2 Adaptations to Abiotic Environment Questions question 1

[Maximum number: 2]

The diagram shows a nephron from a mammal.

Figure for Question IB Biology HL B4.1.2 Adaptations to Abiotic Environment Questions question 1 — IB Biology HL

Outline two adaptations for water conservation in leaves of desert plants.

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