Question

Why nucleus called controller or brain of the cell ?

Answer 1

"The nucleus is called the "brain" of the cell because it holds the information needed to conduct most of the cell's functions. Other molecules make proteins from that information on a regular basis - each moment of our lives."
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Answer 2

Nucleus is called the brain because it contains chromatic material i.e,chromosomes which bear DNA which is the basis of life.It is dna that is responsible for division of cell and reproduction of cell,it even controls the mechanism or working of other cell organelles just as our brain controls our body parts.