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(D) Bacteria perform several beneficial activities in the ecosystem:$1$. Nitrogen fixation: Bacteria like $Azotobacter$ and $Clostridium$ fix atmosphe

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(D) Bacteria perform several beneficial activities in the ecosystem:$1$. Nitrogen fixation: Bacteria like $Azotobacter$ and $Clostridium$ fix atmospheric $N_2$ into ammonia.$2$. Nitrification: Bacteria like $Nitrosomonas$ and $Nitrobacter$ convert ammonia into nitrites and nitrates.$3$. Biogeochemical cycles: Bacteria act as decomposers,breaking down complex organic compounds into simple inorganic substances,which is essential for nutrient cycling.Therefore,all the mentioned activities are useful functions performed by bacteria.

Column-$I$	Column-$II$
$1.$ Silage	$a.$ Measure of water pollution level.
$2.$ Flocs	$b.$ Cattle feed.
$3.$ Biogas	$c.$ Bacteria associated with fungal filaments in water.
$4.$ $BOD$	$d.$ Anaerobic metabolism of organic waste.

List-$I$	List-$II$
$(a)$ Bacteria	$(1)$ Saccharomyces cerevisiae
$(b)$ Mucor	$(2)$ $Bt$ cotton
$(c)$ Yeast	$(3)$ Penicillium notatum
$(d)$ Transgenic organism	$(4)$ Lactobacillus

Column-$I$	Column-$II$
$(A)$ Citric acid	$(i)$ Trichoderma
$(B)$ Cyclosporin $A$	$(ii)$ Clostridium
$(C)$ Statins	$(iii)$ Aspergillus
$(D)$ Butyric acid	$(iv)$ Monascus

One of the useful activities of several bacteria is

Similar Questions

Match the following columns:
Column-$I$ Column-$II$
$1.$ Silage $a.$ Measure of water pollution level.
$2.$ Flocs $b.$ Cattle feed.
$3.$ Biogas $c.$ Bacteria associated with fungal filaments in water.
$4.$ $BOD$ $d.$ Anaerobic metabolism of organic waste.

Match the following columns:
List-$I$ List-$II$
$(a)$ Bacteria $(1)$ Saccharomyces cerevisiae
$(b)$ Mucor $(2)$ $Bt$ cotton
$(c)$ Yeast $(3)$ Penicillium notatum
$(d)$ Transgenic organism $(4)$ Lactobacillus

Who conducted the first study identifying $Bombykol$ as a pheromone?

$S -$ Statement: Cellulase is used in laundry to remove oily stains.
$R -$ Reason: Cyclosporin-$A$ is used to prevent blood clotting in blood vessels.

Match column $I$ with column $II$ and select the correct option using the codes given below.
Column-$I$ Column-$II$
$(A)$ Citric acid $(i)$ Trichoderma
$(B)$ Cyclosporin $A$ $(ii)$ Clostridium
$(C)$ Statins $(iii)$ Aspergillus
$(D)$ Butyric acid $(iv)$ Monascus

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