IB Biology HL B4.2.9 Herbivore and Plant Adaptations Questions
Compare how herbivores use mouthparts, teeth, digestion and detoxification, and how plants deter feeding with spines, stings, toxins and ant mutualisms in IB Biology HL B4.2.9.
Syllabus
First assessment 2025
Course
Biology HL
Level
HL
Exam points
Explain how herbivore mouthparts, teeth, digestion and detoxification support feeding on plant material.
Describe how plant spines, stings and toxic compounds deter herbivores.
Explain how Acacia thorns and nectar sustain ants that protect plants from herbivores.
The photo shows vegetation in the Sonoran Desert, which is part of the hot desert biome.
State one adaptation of plants in hot deserts that can help them to resist herbivory.
One additional mark is available for the construction of your answers for each question.
spines/thorns/stings/spikes OR production of toxins/unpalatable substances OR mimicry/camouflage (to resemble rocks) OR mutualism with an ant/animal which defends the acacia/plant against herbivores; 1
Marking guidance:
max Clarity of communication: [1] The candidate's answers are clear enough to be understood without re-reading. The candidate has answered the question succinctly with little or no repetition or irrelevant material.