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Module 5: Communication, homeostasis and energy
Quick questions on Plant and animal responses: tropisms and auxin, reflexes, and muscle contraction - OCR A-Level Biology A
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are plant responses?Show answer
A tropism is a directional growth response to a stimulus: positive towards the stimulus, negative away. Plant responses are coordinated by plant hormones (growth regulators), especially auxin (IAA).
What is the mammalian nervous system?Show answer
The nervous system is organised into:
What is q1?Show answer
Explain why a shoot bends towards a light source. [3 marks]
What is q2?Show answer
State the order of components in a reflex arc. [2 marks]
What is q3?Show answer
Name the ion that binds to troponin to start muscle contraction. [1 mark]
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