Assertion(A): Nucleus is the controlling centre of a cell. Reason(R): Pores in the nuclear envelop regulate the flow of materials in and out of the nucleus.
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Nucleus is the controlling centre of a cell as it contains chromosomes and genes. ... Besides this, nucleus contains genetic information or reproduction, development & behaviour of an organism. Nuclear membrane is double layered, semipermeable and is perforated by minute, circular nuclear pores.
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