Observe the given figure and answer the question.
The type of microbe that can be grown on only nutritive media and form colonies shown in:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Fig IV
Viruses grow only inside living cells, so they cannot form colonies on nutritive media. Bacteria can. Fig IV shows rod-shaped bacteria; Figs I, II and III are viruses.
Option (4) Fig IV — Correct. Bacteria grow on nutritive media and form colonies that can be seen with the naked eye. The figure that shows such colonies, Fig IV, is the answer.
NCERT Extract:
Microbes in Human Welfare – “… Microbes like bacteria and many fungi can be grown on nutritive media to form colonies (Figure 8.3), that can be seen with the naked eyes. Such cultures are useful in studies on micro-organisms.”