PYQSide ExamsMy practice

Microbes in Human Welfare · Question 34

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

A nitrogen-fixing microbe associated with Azolla in rice fields is

  1. Tolypothrix
  2. Spirulina
  3. Frankia
  4. Anabaena

Answer

(4) Anabaena

Solution

The water fern Azolla has the nitrogen-fixing cyanobacterium Anabaena azollae living in its leaf cavities.

As per NCERT, cyanobacteria such as Anabaena, Nostoc and Oscillatoria fix atmospheric nitrogen and serve as important biofertilisers in paddy (rice) fields.

( Frankia forms root nodules on non-leguminous plants such as Alnus; Spirulina is used as single cell protein.)

Answer: (4)

AIPMT 2012 (Prelims)

Keep practising — Microbes in Human Welfare

2

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

  1. Trichoderma sp. against certain plant pathogens
  2. Ladybird beetle against aphids in mustard
  3. Nucleopolyhedrovirus against white rust in Brassica
  4. Bt-cotton to increase cotton yield
AIPMT 2012 (Prelims)
3

Yeast is used in the production of

  1. Citric acid and lactic acid
  2. Lipase and pectinase
  3. Bread and beer
  4. Cheese and butter
AIPMT 2012 (Prelims)
4

Read the following statement having two blanks (A and B): “A drug used for (A) patients is obtained from a species of the organism (B) .” The one correct option for the two blanks is:

  1. A Organ-transplant, B Trichoderma
  2. A AIDS, B Pseudomonas
  3. A Swine flu, B Monascus
  4. A Heart, B Penicillium
AIPMT 2011 (Mains)
5

Consider the following statements (A-D) about organic farming. Which of these statements are correct?

  1. (B) and (C) only
  2. (B), (C) and (D)
  3. (C) and (D) only
  4. (A) and (B) only
AIPMT 2011 (Mains)
6

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

  1. Acetobacter aceti – acetic acid
  2. Clostridium butylicum – lactic acid
  3. Aspergillus niger – citric acid
  4. Yeast – statins
AIPMT 2011 (Mains)
7

The most common substrate used in distilleries for the production of ethanol is :

  1. Ground gram
  2. Molasses
  3. Soyabean
  4. Corn meal
AIPMT 2011 (Prelims)
8

Which one of the following is not a biofertilizer ?

  1. Agrobacterium
  2. Nostoc
  3. Rhizobium
  4. Mycorrhiza
AIPMT 2011 (Prelims)
9

Secondary sewage treatment is mainly a :

  1. Mechanical process
  2. Chemical process
  3. Biological process
  4. Physical process
AIPMT 2011 (Prelims)
10

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage ?

  1. Propane
  2. Mustard gas
  3. Marsh gas
  4. Laughing gas
AIPMT 2011 (Prelims)
11

An organism used as a Biofertilizer for raising soyabean crop is :

  1. Azotobacter
  2. Azospirillum
  3. Nostoc
  4. Rhizobium
AIPMT 2011 (Prelims)

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)