Choose the most correct answer Microorganisms can be grown i

Choose the most correct answer. Micro-organisms can be grown in liquid or solid media. The difference between these two kinds of media is:

A)We will use liquid media for yeast, while solid media will be used for bacteria

B)No difference whatsoever, just the solid media has some agar added to it.

C)The solid media has to have something to solidify it and, it also has to have a source of oxygen since it cannot be shaken and aerated the way liquid media can.

D)We will use liquid media for bacteria, while solid media will be used for yeast.

solid media is kept in the fridge to keep it solid

Solution

The choice C is most correct answer.

Explanation: Both solid (eg nutrient agar) and liquid media (eg LB broth) are used to grow micro-organisms routinely in research laboratories. The bacteria can be grown on both solid and liquid broth but mostly on solid broth. Similarly, yeast cells can be grown in both types of media. However, the liquid media needs to be occassionaly shaken in order to improve aeration so that the microbe residing in the lower part of the culture broth could also access oxygen. On the other hand, the solid media has large surface area and thus large area for gaseous transport and need not be shaken. The solid media contains agar in it for solidification where as the liquid media does not.