Plants

Question 1

How distribution of IAA causes the roots to bend

Answer 1

1. Greater (elongation) growth on top of root/less growth on bottom of root;
2. (IAA) at bottom of root/where IAA concentration high inhibits expansion/elongation (of cells);
3. (IAA) at top of root/where IAA concentration low leads to expansion/elongation (of cells);

Question 2

IAA

Answer 2

Indole Acetic Acid