Animals and plants respond to changes in their environment. Plants also respond to their environment. The diagram shows a seedling with the apical bud and a lateral bud labelled. In an investigation, three genetically identical seedlings, with the same shoot length, had their apical buds removed. The table shows the treatments for each seedling and their appearance after being grown next to a source of light for five days. The arrows show the direction of the light. Deduce the effect of each treatment on seedlings that have had their apical buds removed. Use the information in the table to support your answer. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Biology
IGCSE&ALevel
EDEXCEL
Exam No:wbi15-01-que-20240608 Year:2024 Question No:3(b)

Answer:

An answer that includes three of the following points:
- (seedling 2) auxin caused \{growth towards the direction of light / (positive) phototropism / cell elongation on the shaded side\} (1)
- (seedling 2) auxin inhibited lateral bud growth (1)
- (seedling 3) gibberellins caused increased \{growth / length\} of seedling (1)
- (seedling 3) gibberellins caused growth of lateral buds (1)

Knowledge points:

CH8 – Coordination, Response and Gene Technology

Solution:

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