Which of the following bacteria is associated with nitrogen fixation?

  • A
    Nostoc
  • B
    Anabaena
  • C
    $E$. coli
  • D
    Azotobacter

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Similar Questions

Identify the $INCORRECT$ statement regarding the role of minerals in plants.

Identify the correct pair:
Column-$I$Column-$II$
$P$. Phosphorus$I$. Splitting of water to liberate oxygen during photosynthesis
$Q$. Potassium$II$. Constituent of cell membranes and all nucleotides
$R$. Magnesium$III$. In more abundant quantities in the meristematic tissue,buds,leaves,and root tips
$S$. Manganese$IV$. Constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure

$P - Q - R - S$

Which of the following options shows the correct correlation between column $I$,$II$,and $III$?
Column $I$Column $II$Column $III$
$A$. Calcium$I$. Required for ionic balance$(i)$. Grey blot on leaves
$B$. Boron$II$. Essential for constitution of nucleic acid$(ii)$. Fruit-yield decreases
$C$. Phosphorus$III$. Required for absorption of calcium$(iii)$. Red blot on leaves
$D$. Chlorine$IV$. Required to activate respiratory enzyme$(iv)$. Fruit-size diminishes
$E$. Manganese$V$. Required for synthesis of mitotic spindle$(v)$. Young root tip begin to die

Match the physiological processes given in Column-$I$ with the mineral elements given in Column-$II$:
Column-$I$Column-$II$
$1$. Muscle contraction$a$. $Mg^{+2}$
$2$. Digestion of food$b$. $Ca^{+2}$
$3$. Energy exchange$c$. $Mo$
$4$. Carbohydrate synthesis$d$. $(PO_4)^{-3}$
$5$. Nitrogen fixation$e$. $Cl^-$

Ammonia provided to crop plants in the form of urea is industrially fixed by . . . . . . .

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