Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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The kidneys filter the blood and regulate water and salts.
Their waste product is excreted as urine.
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Platelets gather at damaged blood vessels and help form clots.
This reduces blood loss after injury.
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Red blood cells contain hemoglobin.
Hemoglobin binds and transports oxygen.
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The femur is the thigh bone.
It is the longest and one of the strongest bones in the body.
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The skin is the body's largest organ by surface area and mass.
It protects internal tissues and helps regulate temperature.
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The heart pumps blood through the circulatory system.
Its contractions deliver oxygen and nutrients to tissues.
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The cell is the smallest structural and functional unit of living organisms.
All living things are made of one or more cells.
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Machu Picchu was built by the Inca civilization.
It is located high in the Andes of Peru.
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Hammurabi was a king of Babylon.
His law code is one of the best-known ancient legal collections.
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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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Magellan's expedition achieved the first circumnavigation.
Magellan died before the voyage was completed by Juan Sebastián Elcano.
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Vasco da Gama reached India by sea in 1498.
He sailed around the southern tip of Africa.
