What term refers to the part of a stem that is jointed?

The term that refers to the part of a stem that is jointed is "node." Nodes are specific points on a stem where leaves or branches originate. They play a crucial role in the structure and growth of plants, as they are areas of growth and development. Each node can produce leaves, which are essential for photosynthesis, and buds that can develop into new shoots or flowers. Understanding nodes is vital in agronomy, as they can influence plant architecture, spacing, and overall health.

In contrast, the sheath refers to a protective covering, often found at the base of leaves, that encloses the stem. The culm typically refers to the main stalk of grasses and similar plants but is not specifically defined as a jointed part. The blade is the flat, extended part of a leaf, which is not related to the jointed characteristics of the stem. Each of these terms has its significance in botany and plant science but does not define the jointed nature of a stem.