EVERYDAY SCIENCE

Detailed explanation-1: -Seedless vascular plants made a major breakthrough in plant evolution because they developed a way to transport materials around the plant body. Plants use xylem to move water and minerals around the plant body and phloem to transport sugars from photosynthesis.

Detailed explanation-2: -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-3: -Evolution of Gymnosperms The fossil plant Elkinsia polymorpha, a “seed fern” from the Devonian period-about 400 million years ago-is considered the earliest seed plant known to date.

Detailed explanation-4: -Lycophytes are the oldest group of vascular plants that has living members. They dominated major habitats for 40 million years about 400 million years ago in the paleozoic.