Which of the following bacteria help in nitrogen fixation from atmosphere.
I. Azotobacter II. Rhizobium III. Azospirillum IV. Lactobacillus

I, III, IV

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I, II, III, IV

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II, III, IV

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I, II, III

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Solution

The correct option is D I, II, III
Rhizobium is a symbiotic bacteria found in the root nodules of leguminous plants that has the ability to fix atmospheric nitrogen. Azospirillum and Azotobacter are free-living bacteria found in the soil. They also enrich the nitrogen content of the soil.
Lactobacillus or Lactic acid bacteria grow in milk to convert it into curd.

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Similar questions

E_{2}

	I		II
p	Thiobacillus denitrificans	i	Nitrogen fixation
q	Nitrosomonas	ii	Ammonification
r	Azotobacter	iii	Nitrification
s	Bacillus vulgaris	iv	Denitrification

Question 30
Choose the forms in which most plants absorb nitrogen

(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Question 30
Choose the forms in which most plants absorb nitrogen

(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

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