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Microbes in Human Welfare

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

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 syllabus

Keep practising — Microbes in Human Welfare

Ques. 2AIPMT 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. 3AIPMT 2000

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

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

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

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

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