AP BIOLOGY

Detailed explanation-1: -The correct option is A trunk. The thickened stem of a tree that supports branches and has a woody outer bark is called the trunk of a tree.

Detailed explanation-2: -In botany, the trunk (or bole) is the stem and main wooden axis of a tree, which is an important feature in tree identification, and which often differs markedly from the bottom of the trunk to the top, depending on the species. The trunk is the most important part of the tree for timber production.

Detailed explanation-3: -Trunk – generally a single “stem, ” but can be multiple-stemmed. Main functions are materials transport and support. Bark – main function is to protect the living tissue called cambium from damage. Roots – two main functions: (1) collect nutrients and water and (2) anchor the tree.

Detailed explanation-4: -Trees are big and tall plants. They have very thick, woody and hard stems called the trunk.

Detailed explanation-5: -Trunk of a tree is an important structure which facilitates the easy differentiation of a tree from other plants. Hence, the trunk usually refers to the main wooden axis of a tree. Bole is a synonym of the trunk. The trunk actually supports the branches of the tree (crown) and is in turn supported by the roots.