A student removes shoot tips and places blocks of agar containing auxin on one side of each cut surface. A preliminary test shows that this concentration stimulates shoot cell elongation. The shoots are kept vertically in darkness.
Which prediction is correct?
auxin on the right causes slower right-side elongation and leftward bending
auxin on the left causes faster left-side elongation and rightward bending
auxin on the left causes slower left-side elongation and rightward bending
auxin on the right causes faster right-side elongation and rightward bending
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.