Some Advantages of Terrestrial Living for Plants 1. More light is available on land than in the water. Carbon dioxide for photosynthesis and oxygen for respiration are present in higher concentrations in air than in water. The first land plants did not have to compete for resources or contend with predation. Some Problems faced by Terrestrial Plants 1.
Water can be hard to obtain.
Evaporation of water tends to cause great water loss. Plants must cope with greater extremes of temperature on land. The lesser density of air compared with water provides little support for body structures. Land plants must adapt to carry on reproductive functions without a constant supply of water. Some Trends in Plant Evolution 1.