Most trees would grow straight toward the light source if they could, gravity is one of the thing holding them back. And the cross-sections would be more slender & circular than usual because they don't need to form reaction wood to resist gravity.
Some plants have more specific gravitropic response and it's harder to predict in that case.
Just a clarification, woody plants can include both monocots and dicots. Woody-ness (a shrub or treelike form) is a trait that has evolved many times independently in plants. Monocots and dicots refer to the number of seed leaves these clades possess (one and two respectively), amongst other differences.
Redsnake1993 t1_j6m6cnn wrote
Most trees would grow straight toward the light source if they could, gravity is one of the thing holding them back. And the cross-sections would be more slender & circular than usual because they don't need to form reaction wood to resist gravity.
Some plants have more specific gravitropic response and it's harder to predict in that case.