Crown Gall causes the vine to develop tumors on which part of the plant?

Crown Gall causes the vine to develop tumors on which part of the plant?

• A. Leaves
• B. Trunk
• C. Roots
• D. Berries

Answer: (B)

Crown Gall is caused by a bacterium that enters through wounds and transfers DNA into plant cells, causing them to grow uncontrollably and form tumor‑like galls. In vines, these swellings typically appear at the crown—the junction where the roots meet the stem—and can extend onto the lower trunk. This location is why the trunk is the best choice among the options: the disease produces noticeable abnormal growth around the stem near soil level, rather than on leaves or berries. While galls can occur on roots as well, the defining and most visible site described here is the trunk area at the crown.

Crown Gall is caused by a bacterium that enters through wounds and transfers DNA into plant cells, causing them to grow uncontrollably and form tumor‑like galls. In vines, these swellings typically appear at the crown—the junction where the roots meet the stem—and can extend onto the lower trunk. This location is why the trunk is the best choice among the options: the disease produces noticeable abnormal growth around the stem near soil level, rather than on leaves or berries. While galls can occur on roots as well, the defining and most visible site described here is the trunk area at the crown.