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WABiologyQuick questions
Unit 4: Surviving in a Changing Environment
Quick questions on Plant tropisms and hormones: WACE Year 12 Biology
2short 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 tropisms?Show answer
A tropism is a growth response of a plant toward or away from a directional stimulus. It is positive if growth is toward the stimulus and negative if growth is away from it. Because plants cannot move, responding by growing is how they adjust to their environment. The main tropisms are:
What is the role of auxin?Show answer
Auxin is a plant hormone that controls growth. It is produced at the tips of shoots and moves down the plant. Its key feature is that it can collect unevenly, and where it is more concentrated it changes the rate of cell elongation. The crucial point is that auxin has opposite effects in shoots and roots:
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