AP BIOLOGY

Detailed explanation-1: -The first nonvascular plants to evolve were the liverworts. The hornworts evolved somewhat later, and mosses apparently evolved last. Of all the bryophytes, mosses are most similar to vascular plants.

Detailed explanation-2: -Pteridophytes were the first group of plants to have developed the vascular tissues.

Detailed explanation-3: -Mosses and liverworts are small, primitive, non-vascular plants. They lack the conductive tissue most plants use to transport water and nutrients. Instead, moisture is absorbed directly into cells by osmosis.

Detailed explanation-4: -Answer and Explanation: Vascular tissue evolved before seeds. This is because vascular tissue is at least 420 million years old while the first seeded plants evolved about 360 million years ago. Both seeds and vascular tissue where key evolutionary steps for land plants.

Detailed explanation-5: -Mosses, liverworts and hornworts are collectively called “bryophytes.” Bryophytes are nonvascular plants: They do not have special tissues-tissues that botanists call “xylem” and “phloem”-to transport fluids and nutrients internally.