| Choose the correct statement. |
| I. pH of human blood is 7.4. |
| II. \[C{{a}^{+}}\] is essential for muscle contraction. |
| III. Nerve cells do not divide because they do not have nucleus. |
| IV. Calcium carbonate is maximum in bones. |
A) I and III
B) I and II
C) Ill and IV
D) I, II, III and IV
Correct Answer: B
Solution :
Nerve cells do not divide because they lack centrosome. Calcium phosphate is the salt, that is found in maximum quantity in bones.
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