Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

Microbes in Human Welfare

AIPMT 2003MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2003

During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded :-

  1. Lignin
  2. Cellulose
  3. Hemi-cellulose
  4. Lipids

Answer

(1) Lignin

Solution

As per NCERT, methanogens such as Methanobacterium grow anaerobically on cellulosic material and produce methane along with CO2 and H2.

Cellulose, hemicellulose and lipids are broken down by anaerobic bacteria during biogas production, but lignin is a complex aromatic polymer that is degraded mainly by aerobic fungi, so it is not broken down under anaerobic conditions.

∴ Lignin is left undegraded.

Answer: (1)

Keep practising — Microbes in Human Welfare

Ques. 2AIPMT 2002

Which bacteria is utilized in Gobar gas plant ?

  1. Nitrifying bacteria
  2. Methanogens
  3. Ammonifying bacteria
  4. Denitrifying bacteria
Ques. 3AIPMT 2002

During the formation of bread it becomes porous due to release of CO2 by the action of : -

  1. Protozoans
  2. Bacteria
  3. Yeast
  4. Virus
Ques. 4AIPMT 2001

Which of the following is a true pair of biofertilizers?

  1. Nostoc and legume
  2. Rhizobium and grasses
  3. Salmonella and E. coli
  4. Azolla and BGA
Ques. 5AIPMT 2001

Which aquatic fern performs nitrogen fixation?

  1. Azolla
  2. Nostoc
  3. Salvia
  4. Salvinia
Out of syllabus
Ques. 6AIPMT 2001

What is B.O.D.?

  1. The total amount of O2 present in water
  2. The amount of O2 utilised by organisms in water
  3. The amount of O2 utilised by microorganisms for decomposition
  4. All of the above
Out of syllabus
Ques. 7AIPMT 2000

Which aquatic fern is used to increase the yield in paddy crop?

  1. Salvinia
  2. Isoetes
  3. Marsilea
  4. Azolla
Ques. 8AIPMT 2000

Which of the following is used to manufacture ethanol from starch?

  1. Saccharomyces
  2. Lactobacillus
  3. Azotobacter
  4. Penicillium

All Microbes in Human Welfare PYQs →

PDFDownload Microbes in Human Welfare PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)