Question

Assertion (A) Red muscles fibres depend on anaerobic process for energy.
Reason (R) Red muscles fibres have more number of mitochondria in them.

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true, but R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (D)

Assertion is false, but Reason is true. Assertion can be corrected as
Red muscle fibres have more number of mitochondria but less sarcoplasmic reticulum. These fibres are dark red in colour due to the presence of myoglobin. These carry out aerobic respiration.
White muscle fibres possess very less quantity of myoglobin and appear pale or whitish. Number of mitochondria are also few in them, but the amount of sarcoplasmic reticulum is huge. These depend on anaerobic process for energy.