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Microbes in Human Welfare · Question 75

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

Which aquatic fern performs nitrogen fixation?

  1. Azolla
  2. Nostoc
  3. Salvia
  4. Salvinia

Answer

(1) Azolla

Solution

Azolla is an aquatic fern whose leaf cavities harbour the nitrogen-fixing cyanobacterium Anabaena azollae; it is used as a biofertiliser in paddy fields.

Nostoc is a cyanobacterium (not a fern), Salvia is a flowering plant and Salvinia is a water fern that does not fix nitrogen.

Answer: (1)

Out of syllabusAIPMT 2001

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2

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
3

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

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

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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