Which one of the following is used for storing biological tissues?

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Which one of the following is used for storing biological tissues?

Liquid nitrogen
Liquid helium
Liquid argon
Liquid bromine
This question was previously asked in
UPSC CDS-2 – 2020
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Liquid nitrogen is commonly used for cryopreservation, which is the process of preserving biological tissues, cells, and organs at very low temperatures.
Liquid nitrogen boils at -196°C (-320°F). This extremely low temperature effectively halts biological activity, including enzymatic reactions and cellular degradation, allowing long-term storage of samples such as sperm, eggs, embryos, blood cells, tissue biopsies, and even whole organs for transplantation in some cases.
Liquid helium boils at an even lower temperature (-269°C) but is more expensive and typically used for specialized scientific applications like cooling superconducting magnets. Liquid argon (-186°C) has some industrial uses but is not standard for biological cryopreservation. Bromine is a liquid at room temperature and is highly toxic and corrosive, not suitable for storage.

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