Question

question 9
what is the main difference among seedless plants, gymnosperms, and angiosperms?
their ecosystem adaptations
their vascular tissue
their leaf arrangements
their reproductive structures

Explanation:

• Seedless plants (e.g., ferns, mosses) reproduce via spores. Gymnosperms (e.g., conifers) have naked seeds (not enclosed in an ovary). Angiosperms (flowering plants) have seeds enclosed in a fruit (from a flower/ovary).
• Ecosystem adaptations vary but are not the main distinction. Vascular tissue: some seedless plants (ferns) have vascular tissue, mosses don’t; gymnosperms and angiosperms do, so this isn’t the main difference. Leaf arrangements are not a defining difference across these groups. Reproductive structures (spores vs. naked seeds vs. seeds in fruits/flowers) is the key distinction.

Answer:

D. their reproductive structures