Practice Pakistan questions with answers and explanations.
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Common salt is sodium chloride.
Its chemical formula is NaCl.
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Human cells use oxygen in cellular respiration.
The process releases energy from food molecules.
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Human body cells normally contain 46 chromosomes in 23 pairs.
Reproductive cells contain 23 chromosomes.
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Sunlight helps the skin produce vitamin D.
This vitamin supports calcium absorption and bone health.
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Christopher Columbus reached islands in the Caribbean in 1492.
His voyage connected Europe and the Americas on a sustained basis.
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Severe vitamin C deficiency causes scurvy.
Symptoms include weak gums, bruising, and poor wound healing.
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Vasco da Gama reached India by sea in 1498.
He sailed around the southern tip of Africa.
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Vitamin D deficiency can impair bone mineralization in children.
The resulting condition is called rickets.
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Magellan's expedition achieved the first circumnavigation.
Magellan died before the voyage was completed by Juan Sebastián Elcano.
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Iron is a key component of hemoglobin.
Insufficient iron can lead to iron-deficiency anemia.
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The Silk Road was a network of overland and maritime routes.
It carried goods, ideas, and technologies across Eurasia.
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Specialized cells in the pancreas produce insulin.
Insulin helps regulate blood glucose.
