Briefly state some of the problems that plants had to overcome as ...

[go.lag]

Briefly state some of the problems that plants had to overcome as they adapted to land and how they
  did that. What will be an ideal response?

Question 2

Briefly state why the development of the amniote egg was so significant in the evolution of the
  reptiles. What will be an ideal response?

[Mholman93]

Answer to Question 1

Plants had to solve some of the same problems that animals did by dealing with the effects of
desiccation, gravity, and reproduction. Vascular plants have a tissue system for the movement of water
and nutrients, and for support. The development of seeds allowed plants to reproduce without
problems of drying out.

Answer to Question 2

Amphibians were limited in colonizing land because they had to return to water to lay their gelatinous
eggs. Reptiles developed amniote eggs in which the developing embryo is surrounded by a liquidfilled
sac and provided with food and a waste sac. This egg allowed reptiles to colonize all parts of the
land.