Download App

STD 12 - 8. microbes in human welfare — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 8. microbes in human welfare1 Mark
MCQ
Azotobacter and Bacillus polymyxa are
  • A
    Decomposers
  • ✓
    Nonsymbiotic nitrogen fixers
  • C
    Symbiotic nitrogen fixers
  • D
    Pathogenic bacteria
✓

Answer

Correct option: B.
Nonsymbiotic nitrogen fixers
b
(b)Azotobacter and Bacillus polymyxa are free living or non-symbiotic nitrogen fixing bacteria of soil, which increase fertility of soil and hence yield of crop plants.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 12 - 8. microbes in human welfare→STD 12 - 8. microbes in human welfare — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The female children of a haemophilic man and a carrier woman are likely to be
→
Match the animals given in column A with their location in column B:
Column AColumn B
(i) Dodo(A) Africa
(ii) Quagga(B) Russia
(iii) Thylacine(C) Mauritius
(iv) Steller's sea cow(D) Australia
Choose the correct match from the following:
→
Which of the following statements is incorrect?
→
Acacia, Prosopis and Capparis belongs to ?
→
A pond is a
→
The causative agent of elephantiasis is :
→
Genetic variation in a population arises due to
→
Oestrous cycle is found in:
→
In which characters air pollinated flowers differ from insect pollinated ones
→
If a recombinant $DNA$ bearing gene for ampicillin resistance is transferred into $E.$ coli cells and the host cells are spread on agar plates containing ampicillin, then
→