The plant body of Thallophyta is ........

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(A) The plant body of Thallophyta (primarily algae) is haploid $(n)$ and represents the gametophytic phase of the life cycle.In these organisms,the ma

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Haploid and gametophytic

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(A) The plant body of Thallophyta (primarily algae) is haploid $(n)$ and represents the gametophytic phase of the life cycle.In these organisms,the main plant body is undifferentiated into roots,stems,or leaves,forming a thallus.The gametophytic phase produces gametes through mitosis,which fuse to form a diploid zygote $(2n)$.In most algae,the zygote undergoes meiosis to return to the haploid state,thus maintaining the haploid gametophytic plant body as the dominant phase.

Column-$I$	Column-$II$
$(A)$ Blue-green algae	$(p)$ Chlamydomonas
$(B)$ Unicellular algae	$(q)$ Spirogyra
$(C)$ Filamentous algae	$(r)$ Volvox
$(D)$ Colonial algae	$(s)$ Nostoc

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Column-$I$ lists various types of algae, and Column-$II$ lists examples of algae. Select the correct option.
Column-$I$ Column-$II$
$(A)$ Blue-green algae $(p)$ Chlamydomonas
$(B)$ Unicellular algae $(q)$ Spirogyra
$(C)$ Filamentous algae $(r)$ Volvox
$(D)$ Colonial algae $(s)$ Nostoc

$Spirogyra$ is a

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