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Question

The functional activities of a cell are controlled and directed by the

A
Protoplasm
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B
Nucleus
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C
Mitochondria
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D
Endoplasmic reticulum
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Solution

The correct option is B Nucleus
The nucleus is the most important and the largest component of the cell. Nucleus regulates the four main functions of the cell which are protein synthesis, cell division, growth and differentiation are carried out by the nucleus. Nucleus regulates all these cellular activities by controlling the enzymes required for cellular processes. Enzymes are proteins and protein synthesis is controlled by nucleus as mRNA required for protein synthesis is made from DNA which is situated in the nucleus.

Hence the correct option is B.

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