Final answer:
Conk, Dutch Elm Disease, and Gall are related to plant pathology; Conk is a type of fungal growth, Dutch Elm Disease is a devastating fungal disease that affects elm trees, and a Gall is an abnormal plant growth often caused by various agents.
Step-by-step explanation:
When identifying what Conk, Dutch Elm Disease, and Gall are, it is essential to understand that they are associated with trees but represent different concepts. Conk refers to a type of fungal growth, specifically the fruiting body of wood-decaying fungi. Dutch Elm Disease is indeed a type of disease caused by the fungus Ophiostoma ulmi, which affects elm trees by infecting their vascular system and is spread by the elm bark beetle. Lastly, a Gall can be caused by various agents including fungi, bacteria, insects, and mites, and represents an abnormal growth on a plant. Therefore, while they are related to plant pathology, the correct answer is that they are types of diseases, with conk also being a type of fungus.