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Microbes in Human Welfare · Question 70

AIPMT 2003MCQHard📈 Topic in 12% papers+4−1
1

Which of the following plants are used as green manure in crop fields and in sandy soils ?

  1. Calotropis procera and Phyllanthus niruri
  2. Dichanthium annulatum and Azolla nilotica
  3. Saccharum munja and Lantana camara
  4. Crotalaria juncea and Alhagi camelorum

Answer

(4) Crotalaria juncea and Alhagi camelorum

Solution

Green manuring means growing a fast-growing crop and ploughing it into the soil to add organic matter and nitrogen.

∵ Leguminous plants carry nitrogen-fixing Rhizobium in their root nodules (as per NCERT, a symbiotic biofertiliser), they are the best green manures.

⇒ Crotalaria juncea (sunn hemp) and Alhagi camelorum (camel thorn, a desert legume) are both legumes and are used as green manure in crop fields and sandy soils.

⇒ Calotropis, Lantana, Saccharum munja and Dichanthium (a grass) are not legumes.

Answer: (4)

AIPMT 2003

Keep practising — Microbes in Human Welfare

2

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
AIPMT 2003
3

Which bacteria is utilized in Gobar gas plant ?

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

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
AIPMT 2002
5

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
AIPMT 2001
6

Which aquatic fern performs nitrogen fixation?

  1. Azolla
  2. Nostoc
  3. Salvia
  4. Salvinia
Out of syllabusAIPMT 2001
7

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 syllabusAIPMT 2001
8

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

  1. Salvinia
  2. Isoetes
  3. Marsilea
  4. Azolla
AIPMT 2000
9

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

  1. Saccharomyces
  2. Lactobacillus
  3. Azotobacter
  4. Penicillium
AIPMT 2000

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