A young sunflower shoot was held upright in a lightproof growth cabinet. During the investigation, light entered through a shutter in either the east wall or the west wall. Marks on the east-facing and west-facing sides of the shoot were used to compare increases in length.
At the end of the investigation, the shoot had curved towards the east wall.
Which statement is consistent with these observations?
light entered from the west and the east-facing side showed a greater increase in length
light entered from the east and the west-facing side showed a greater increase in length
light entered from the east and the east-facing side showed a greater increase in length
light entered from the west and the west-facing side showed a greater increase in length
105 exam-style questions on Edexcel GCSE Biology 6.3 Plant hormones, covering 6.3.1 Plant hormones and tropisms and 6.3.2 Commercial uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.