1. Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.

Soln:

This is an issue of debate. It depends on the way we evaluate evolution. If the complexity of the body is a parameter, then humans are far superior to bacteria. Bacteria have a cellular level of organisation, and humans have an organ-system level organisation.

On the other hand, if we consider the ability to survive, bacteria have evolved more than human beings. Humans can live in any environment but with artificial protection. Humans cannot live in a harsher climate, whereas bacteria can be found anywhere on earth. They can survive even harsh climates, such as hydrothermal vents and sulphur springs.