How much does an adult’s brain weigh?
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1.4kg
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2Kg
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2.5Kg
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900gm
Reveal answer
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A
Correct answer
Explanation
An adult human brain weighs approximately 1.3-1.4 kg (about 3 pounds). Despite being only 2% of body weight, it consumes about 20% of the body's energy. The other options are either too low (900gm is a child's brain weight) or too high (2-2.5kg would be extremely large for a human brain).
AI explanation
The average adult human brain weighs about 1.4 kilograms (roughly 3 pounds). This is a commonly cited anatomical fact used as a benchmark, distinguishing it from much smaller figures like 900 grams, which is closer to weights seen at earlier developmental stages.