An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar block is placed so that it covers only one side of the top of the shoot. You would expect the shoot to ____.
A) stop growing
B) grow faster on the side away from the agar block
C) grow straight up
D) grow faster on the side with the agar block
E) grow faster on both the side away from the agar block and on the side with agar block

Question

Quizplus · Accepted Answer

Auxin is a plant hormone that promotes cell elongation. When the agar block containing auxin is placed on one side of the shoot, it causes the cells on that side to elongate more than the cells on the opposite side. This differential growth causes the shoot to grow faster on the side with the agar block, leading to bending towards the opposite side.

An Agar Block Filled with Auxin Is Placed on Top