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(D) The correct matches are as follows:$(1)$ Mycorrhiza: These are symbiotic associations of fungi with roots of higher plants,which help in the absor

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$(1-Q), (2-S), (3-P), (4-R)$

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(D) The correct matches are as follows:$(1)$ Mycorrhiza: These are symbiotic associations of fungi with roots of higher plants,which help in the absorption of phosphorus from the soil. Thus,$(1-Q)$.$(2)$ Nostoc: These are cyanobacteria that act as autotrophic $N_2$-fixers. Thus,$(2-S)$.$(3)$ Azospirillum: These are bacteria that live in the soil and act as free-living $N_2$-fixers. Thus,$(3-P)$.$(4)$ Rhizobium: These bacteria form symbiotic associations with the roots of leguminous plants to fix nitrogen. Thus,$(4-R)$.Therefore,the correct sequence is $(1-Q), (2-S), (3-P), (4-R)$.

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-$I$	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	$e$. $Cl^-$

Select 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

Similar Questions

Nitrogen 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.

Analogy type questions:
$(1)$ Nitrogenase : Oxygen sensitive :: Leghaemoglobin : ........
$(2)$ Microbe on roots of Alnus : Frankia :: Roots of leguminous plants : Rhizobium :: Denitrification : Pseudomonas :: Biological nitrogen fixation : ........

Nitrates of soil are also leached deep into the earth by . . . . . . .

$A$ farmer adds/supplies $Na, Ca, Mg$ and $Fe$ regularly to his field and yet he observes that the plants show deficiency of $Ca, Mg$ and $Fe$. Give a valid reason and suggest a way to help the farmer improve the growth of plants.

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Select 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