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Microbes in Human Welfare · Question 77

AIPMT 2000MCQEasy📈 Topic in 12% papers+4−1
1

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

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

Answer

(4) Azolla

Solution

Azolla is a small floating water fern that harbours the nitrogen-fixing cyanobacterium Anabaena in its leaves.

⇒ As per NCERT, cyanobacteria such as Anabaena and Nostoc fix atmospheric nitrogen and act as biofertilisers in paddy fields.

∴ Azolla grown in paddy fields enriches the soil with nitrogen and increases the yield.

Answer: (4)

AIPMT 2000

Keep practising — Microbes in Human Welfare

2

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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