The nucleus is enclosed in:

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(B) The nucleus is a membrane-bound organelle found in eukaryotic cells. It is enclosed by a nuclear envelope,which consists of two parallel membranes

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Double and porous layer

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(B) The nucleus is a membrane-bound organelle found in eukaryotic cells. It is enclosed by a nuclear envelope,which consists of two parallel membranes (inner and outer membranes). These membranes are separated by a space called the perinuclear space. The nuclear envelope is interrupted by minute pores known as nuclear pores,which allow the movement of $RNA$ and proteins between the nucleus and the cytoplasm. Therefore,the nucleus is enclosed in a double and porous layer.

Column-$I$	Column-$II$
$(1)$ Chromosome arms are of equal length	$(a)$ Submetacentric
$(2)$ One arm of the chromosome is shorter	$(b)$ Acrocentric
$(3)$ One arm is extremely long and the other is very short	$(c)$ Telocentric
$(4)$ Terminal centromere	$(d)$ Metacentric

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