AP BIOLOGY

Detailed explanation-1: -Ferns are the most advanced group of seedless vascular plants. They are distinguished by large leaves called fronds and small sporangia-containing structures called sori, which are found on the underside of the fronds.

Detailed explanation-2: -Ferns are seedless, vascular plants. They contain two types of vascular tissue that are needed to move substances throughout the plant. Evolutionarily, this addition of vascular tissue to plants is what allowed ferns to grow up and out rather than just spreading along the ground.

Detailed explanation-3: -A compound leaf-that is, a leaf with many fine and deep divisions-is a frond, such as on ferns and palm trees. Although commonly referring to the leafy part of a fern or palm, the noun frond can also refer to anything that has a similar shape to a palm frond or fern frond.

Detailed explanation-4: -These are called fronds to distinguish them from the leaves of flowering plants. Leaves in flowering plants are purely concerned with photosynthesis whereas fern fronds have both a photosynthetic function and a reproductive function. Each fern plant may have from one to many fronds.