Question

45. Name three adaptations plants have made to terrestrial life.

Answer 1

45, when adapting to land, plants had to find ways to obtain resources for nutrition, resist desiccation and find ways of reproduction.

The plants adapted to land by obtaining nutrition both from below and above the groud. Water and nutrients from the soil was absorbed by root sytem whereas light and CO2 required for photosynthesis was absorbed by leaves- the shoot system. The evolution of vascular tissues has made it possible to distribute water and food throughout the plant body.

To resist dessication, plants evolved cuticle and stomata. Cuticle the waxy layer to resist water and gas loss, stomata small tiny pores for exchange of gases and transpiration. Stomata regulates according to the climate

Another important evolution is the internal fertilisation in plants. the gametes are fertilised inside the female plant than dispersing it as seen in algae. The gametes are packed inside which has dehyrdration resistant outer coating layers to maintain its viability