Flashcards For NEET Biology - Microbes in Human Welfare

Flashcards for NEET Biology are designed to boost your NEET preparation. Find below flashcards for Microbes in Human Welfare. These flashcards on Microbes in Human Welfare are prepared as per the NEET syllabus. This is helpful for aspirants of NEET and other exams during last-minute revision. Flashcards For NEET Biology – Microbes in Human Welfare, covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Biology. Solve NEET Biology MCQs to check your understanding and outperform in the exam.

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Name of the NEET sub-section


Flashcards helpful for


Microbes in Human Welfare

NEET exams


class 12 microbes in human welfare 1
class 12 microbes in human welfare 2
class 12 microbes in human welfare 3
class 12 microbes in human welfare 4


Microbes in Human Welfare

Lactic acid bacteria (LAB)

Gram-positive bacteria

Convert milk to curd

Increase vitamin B12 content

E.g. Lactobacillus


An antibiotic produced by Penicillium notatum (mould)

Discovered by Alexander Fleming

Ernst Chain and Howard Florey identified the full potential as an antibiotic and awarded with Nobel prize in 1945 with Fleming

Organic compounds produced by microbes

Citric acid- Aspergillus niger

Acetic acid- Acetobacter aceti

Butyric acid- Clostridium butylicum

Ethanol- Saccharomyces cerevisiae (yeast)

Enzymes produced by microbes

Lipases- used to remove stains

Pectinases and proteases- for clearing bottled juices

Streptokinase- ‘clot buster’ for removing clots in blood vessels

Cyclosporin A

Produced by- Trichoderma polysporum (fungus)

Usage- as an immunosuppressant during organ-transplant


Produced by- Monascus purpureus (yeast)

Usage- blood-cholesterol lowering agent, inhibits cholesterol synthesis

Biological treatment in STPs

Secondary treatment

The primary effluent is treated first by aerobic microbes and then the activated sludge is treated by anaerobic bacteria

Biogas is produced and effluent is released into water bodies


A mixture of methane and other gases used as a fuel

Produced by- Methanogens (anaerobic bacteria)

Present in the rumen of cattle

Cattle dung is used to produce biogas

Biological control agents

Ladybird beetle to control aphids

Dragonflies to control mosquitoes

Bacillus thuringiensis (Bt) to control butterfly caterpillars

Trichoderma (fungus) to control plant pathogens

Nucleopolyhedrovirus (Baculoviruses) to control insects

Bacteria as biofertilisers

Symbiotic bacteria- Rhizobium

Free-living bacteria- Azospirillum, Azotobacter

Increase nitrogen content of the soil


A symbiotic association of fungi with plants

Fungi absorb phosphorus from soil

Glomus is a genus of mycorrhizal fungi present in plant roots

Cyanobacteria as biofertilisers

Fix atmospheric nitrogen

Extensively used in paddy fields

E.g. Anabaena, Nostoc, Oscillatoria, etc.

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