A seed germinates in darkness. Its root grows downwards.
Which statement explains this response?
the root responds negatively to gravity
the root responds negatively to light
the root responds positively to light
the root responds positively to gravity
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.