Fact 1: The looseness of soil has a positive impact on a plant 's roots' growth in that soil.

Fact 2: Pinions tolerate drought and alkaline soil, but prefer loose, well-drained soils.

Given the two facts above, answer the question "well-drained soil has a positive impact on a plant 's what growth in that soil" with the following options: 
- stem
 - heat
 - fibrous
 - leaf
 - tissue
 - rice
 - flower
 - roots


 

        roots 