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Ultrasound is sound with frequency above 20 kHz.
Hence the keyed answer is Above 20 kHz.
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Most photosynthesis occurs in the leaves.
Hence the keyed answer is Leaves.
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ISRO launched it from the Satish Dhawan Space Centre.
So the correct answer is Satish Dhawan Space Centre.
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Cold water dissolves/holds more carbon dioxide.
So the correct answer is Chilled water attracts more carbon dioxide.
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Non-flammable helium is preferred over hydrogen.
So the correct answer is Helium.
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