Question

Why are seed bearing plants widely distributed throughout the world?

Answer 1

The gymnosperms and the angiosperms together constitute seed-bearing plants. These plants have been a successful group in the history, because of the evolution of seeds and pollen. The seed is a superior unit of dispersal in comparison to the naked spore as it carries a food reserve and, in angiosperms, a protective layer. Seedless plants depend on the presence of liquid water for sperm dispersal whereas pollen makes water unnecessary for sperm transport. Instead, the eggs are being fertilized after male nuclei are transported within the protective pollen grain to the female reproductive parts, usually by pollinating agents such as the wind or insects . This is the reason why seed-bearing plants are widely distributed throughout the world.