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B
Protoplasm
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C
Germplasm
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D
Sarcoplasm
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Solution
The correct option is D Sarcoplasm
Each muscle fibre(muscle cell) is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm(cytoplasm of muscle fibre).
Sarcoplasm is a water solution containing ATP and phosphagens, as well as the enzymes and intermediate and product molecules involved in many metabolic reactions. The most abundant metal in the sarcoplasm is potassium.
Hence The cytoplasm of muscle fibre is known as sarcoplasm.