Chapter-2:Microbes in human welfare
Microbes are beneficial as well as detrimental to the welfare of human beings. Microbes are utilized in many
ways for human beings. These microscopic organisms produce half the oxygen in the world. Many types of
fungus and other microbes release enzymes that digest dead stuff. They are more than half of the living
biomass on the planet. In human body, 9 out of 10 cells are microbes. Microbes are everywhere on our body,
in homes, far below the earth’s surface and up to the atmosphere, in cold, cool, warm and hot and very
hot places, and even in places without oxygen. Microorganisms always live in water.
They can eat all sorts of things, including oil, rocks, dead and living plants and animals.
The pattern in the number of questions asked in NEET from Microbes is a really uneven one and there
have been regular rise and fall in the number of questions asked. All in all, a total of 27
questions have been asked in the past 11 years. However, the last year saw an abrupt increase
in the number of questions being asked with 6 questions. Also, in the year of 2012, an
enormous 7 questions were asked. However, on other side, the number of questions in the other
years have remained 3, limiting to 0 in 2015 and 2009. Hence, making a wild guess, we can estimate 2-3
question being asked in the years to follow.
The following bar-graph depicts the variation of number of questions being asked:
The important topics to cover in Microbes are:
• Microbes in Household
• Microbes in Sewage Treatment
• Microbes used in production of Biogas and Biofertilizers
Tips and Tricks:
Since there has been irregularity in the number of questions appearing in the paper from Microbes,
it is best to keep this chapter to your strength as this chapter can be the deal-breaker in one
of the years to follow. The following points might help the students in putting this chapter in their good books:
1. Reading NCERT is must for this topic. Here is the link to NCERT PDF version of the topic:
2. Making Flash Cards will be beneficial as this chapter will not require much revision as students must
have been well versed in this topic from their early days.
3. The past year questions must be solved along with the questions available at the end of the chapter in NCERT.
4. The summary given at the end of NCERT must be given proper reading.
5. Practice a large number of questions from this topic and leave no stones unturned to make this chapter
one of your strengths.