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(B) The structure of a mature embryo sac in angiosperms consists of:$1$. Synergids: These are two specialized cells present at the micropylar end, whi

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$a-3, b-4, c-2, d-1$

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(B) The structure of a mature embryo sac in angiosperms consists of:$1$. Synergids: These are two specialized cells present at the micropylar end, which possess a special cellular thickening called the filiform apparatus that guides the pollen tube into the synergid.$2$. Central cell: This is the largest cell of the embryo sac, containing two polar nuclei.$3$. Antipodals: These are three cells situated at the chalazal end of the embryo sac.$4$. Egg cell: This is the female gamete located at the micropylar end, flanked by the two synergids.Matching these:$(a)$ Synergids - $(3)$ Filiform apparatus$(b)$ Central cell - $(4)$ Polar nuclei$(c)$ Antipodals - $(2)$ Chalazal end$(d)$ Egg cell - $(1)$ Female gameteTherefore, the correct sequence is $a-3, b-4, c-2, d-1$.

Match the following columns:
Column-$I$ Column-$II$
$(a)$ Synergids $(1)$ Female gamete
$(b)$ Central cell $(2)$ Chalazal end
$(c)$ Antipodals $(3)$ Filiform apparatus
$(d)$ Egg cell $(4)$ Polar nuclei

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Column-$I$	Column-$II$
$(a)$ Synergids	$(1)$ Female gamete
$(b)$ Central cell	$(2)$ Chalazal end
$(c)$ Antipodals	$(3)$ Filiform apparatus
$(d)$ Egg cell	$(4)$ Polar nuclei

Match the following columns:Column-$I$Column-$II$$(a)$ Synergids$(1)$ Female gamete$(b)$ Central cell$(2)$ Chalazal end$(c)$ Antipodals$(3)$ Filiform apparatus$(d)$ Egg cell$(4)$ Polar nuclei