-If you cut off the top of a carrot and place it in water to see if you can get it to grow new roots, you should add
A) more than 10−2 g/L of auxin.
B) approximately 10−8 g/L of auxin.
C) at least 10−4 g/L of auxin.
D) equal amounts of auxin and cytokinin.

Question

-If you cut off the top of a carrot and place it in water to see if you can get it to grow new roots, you should add
A) more than 10−2 g/L of auxin. 
B) approximately 10−8 g/L of auxin. 
C) at least 10−4 g/L of auxin. 
D) equal amounts of auxin and cytokinin.

Quizplus · Accepted Answer

Auxin is a plant hormone that promotes root development. Too much auxin can actually inhibit root growth. Research suggests that a concentration of around 10−8 g/L of auxin is optimal for rooting cuttings, including carrot tops. Therefore, option B is the best choice.

-If You Cut Off the Top of a Carrot and Place