A scientist cut the tip off a young shoot and stood the tip on a small block of agar jelly for a few hours.
The tip was thrown away.
The agar block was then placed on the left side only of the cut top of a different shoot.
The shoot was kept in the dark.
Which result would the scientist expect?
The shoot bends to the left, towards the side with the agar block
The shoot bends to the right, away from the side with the agar block
The shoot grows straight up, because there is no light from either side
The shoot stops growing, because the tip that makes auxin has been removed
1
59 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.