In which of the following angiosperms do the | vedclass

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(A) The correct answer is $A$. $Casuarina equisetifolia$ is a non-leguminous angiosperm that forms a symbiotic relationship with the filamentous actin

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Casuarina equisetifolia

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(A) The correct answer is $A$. $Casuarina equisetifolia$ is a non-leguminous angiosperm that forms a symbiotic relationship with the filamentous actinomycete $Frankia$. This bacterium resides in the root nodules of the plant and is responsible for nitrogen fixation. $Crotalaria juncea$ and $Cicer arietinum$ are legumes that form nodules with $Rhizobium$,which is not a filamentous bacterium. $Cycas revoluta$ is a gymnosperm,not an angiosperm,and it forms coralloid roots with $Anabaena$ or $Nostoc$.

In which of the following angiosperms do the root nodules contain filamentous nitrogen-fixing microorganisms?

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$Frankia$ is free-living in soil,but as symbionts,can fix atmospheric nitrogen.

Legume plants are important because they

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