Fact 1: Roots have primary and secondary meristems for growth in length and width.

Fact 2: Special types of primary roots are tap roots or turnips.

Given the two facts above, answer the question "What do turnips use to grow in length and width?" with the following options: 
- epidermal
 - light energy
 - Energy.
 - bacteria
 - meristem
 - fungi
 - viruses
 - Energy


 

     meristem    