MCQ
Frame work element in plants are:
- AMagnesium, copper and iron
- BCopper, carbon and oxygen
- CMagnesium, calcium and nitrogen
- ✓Carbon, hydrogen and oxygen
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$I$. Located at lateral wall of the right atrium
$II$. Heart of heart
$III$. It initiates the rhythmic contractile activity of the heart
$IV$. It is called pace keeper of the heart
$V$. It is called pace maker of the heart
The option with correct statements is/are