Assertion $A$: Leguminous plants increase soil fertility.
Reason $R$: Azotobacter fixes atmospheric $N_2$.
Reason $R$: Azotobacter fixes atmospheric $N_2$.
- A$A$ and $R$ are both true and $R$ is the correct explanation of $A$.
- B$A$ and $R$ are both true but $R$ is not the correct explanation of $A$.
- C$A$ is true and $R$ is false.
- D$A$ is false and $R$ is true.
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Similar Questions
Which one of the following is a wrong statement?
Medium
View SolutionSelect the correct option for the following matches:
$(1)$ For healthy growth of plants $(a)$ Nitrogen $(2)$ As a part of vitamins $(b)$ Manganese $(3)$ In enzymes associated with fat metabolism $(c)$ Cobalt $(4)$ For the activity of phosphatase enzyme $(d)$ Magnesium
| $(1)$ For healthy growth of plants | $(a)$ Nitrogen |
| $(2)$ As a part of vitamins | $(b)$ Manganese |
| $(3)$ In enzymes associated with fat metabolism | $(c)$ Cobalt |
| $(4)$ For the activity of phosphatase enzyme | $(d)$ Magnesium |
Medium
View SolutionMatch Column-$I$ and Column-$II$ and choose the correct option given below the columns.
Column-$I$ (Element) Column-$II$ (Function) $A$. Calcium $I$. Required for ionic balance $B$. Boron $II$. Essential for constitution of nucleic acid $C$. Phosphorus $III$. Required for absorption of calcium $D$. Chlorine $IV$. Required to activate respiratory enzyme $E$. Manganese $V$. Required for synthesis of mitotic spindle
| Column-$I$ (Element) | Column-$II$ (Function) |
|---|---|
| $A$. Calcium | $I$. Required for ionic balance |
| $B$. Boron | $II$. Essential for constitution of nucleic acid |
| $C$. Phosphorus | $III$. Required for absorption of calcium |
| $D$. Chlorine | $IV$. Required to activate respiratory enzyme |
| $E$. Manganese | $V$. Required for synthesis of mitotic spindle |
MediumAIIMS 2013
View SolutionSelect the correct match for $X$ and $Y$:
Column $X$ Column $Y$ $(1)$ Mycorrhiza $(P)$ Free-living $N_2$-fixer $(2)$ Nostoc $(Q)$ Phosphorus absorption $(3)$ Azospirillum $(R)$ Leguminous plants $(4)$ Rhizobium $(S)$ Autotrophic $N_2$-fixer
| Column $X$ | Column $Y$ |
| $(1)$ Mycorrhiza | $(P)$ Free-living $N_2$-fixer |
| $(2)$ Nostoc | $(Q)$ Phosphorus absorption |
| $(3)$ Azospirillum | $(R)$ Leguminous plants |
| $(4)$ Rhizobium | $(S)$ Autotrophic $N_2$-fixer |
Medium
View SolutionNitrogen is required mainly by which of the following parts of the plants?
$I.$ Meristematic tissues
$II.$ Differentiating tissues
$III.$ Apical tissues
$IV.$ Metabolically active cells
Choose the correct option.
$I.$ Meristematic tissues
$II.$ Differentiating tissues
$III.$ Apical tissues
$IV.$ Metabolically active cells
Choose the correct option.
Medium
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