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Life Processes — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLife Processes1 Mark
MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : The accumulation of lactic acid in the muscles causes muscle cramps.
Reason : During vigorous physical exercise leg muscles respire anaerobically.
  • ✓
    Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.
✓

Answer

Correct option: A.
Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
When anaerobic respiration takes place in human muscles, the glucose is converted into lactic acid with release of small amount of energy. The sudden build up of lactic acid in our muscles during vigorous physical activity can cause muscular cramps.

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