IAA And Cell Elongation.

Question 1

What are the condition for phototropism?

Answer 1

• The presence of a stimulus with different concentration on both sides of the plant. / - uneven distribution of auxins on both sides of the plant.

Question 2

Explain the hypothesis that explains the role of this hormone in causing this change.

Answer 2

A) first IAA binds to a membrane receptor protein./ -B) this cause a proton pump to send the ions into surrounding cell walls creating concentration gradient./ C) the gradient lowers the ph in the cell wall and appears to weaken bonds between cellulose wall molecules./ d) an influx of water due to osmosis pushes on walls changing the cell’s shape.