Calyptra develops from

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(A) In bryophytes like $Funaria$,the zygote develops into a sporophyte within the archegonium. As the sporophyte grows,the venter of the archegonium a

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Venter of archegonium

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(A) In bryophytes like $Funaria$,the zygote develops into a sporophyte within the archegonium. As the sporophyte grows,the venter of the archegonium also enlarges to accommodate it. This enlarged,haploid,protective covering derived from the venter of the archegonium is known as the calyptra. It serves to protect the developing young capsule from desiccation and mechanical injury.

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