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23 NCEA Style Question: Plant Responses
1. Etiolation is a condition in plants caused by growth in the absence of light. The stem becomes long and thin, the leaves are yellow in colour, and the cells are elongated with weak cell walls. The photo below shows an etiolated plant on the left, next to a plant grown in normal sunlight on the right.
Chriwick Chap CC 3.0
(a) Identify the plant hormone responsible for etiolation:
(b) Explain how etiolation occurs and discuss how it acts a survival mechanism for plants (you may use more paper if required):
