Biology
Plants are killed in winter by frost

because respiration ceases at such low temperature
because of desiccation and mechanical damage to the tissues
because there is no transpiration
because no photosynthesis takes place at such low temperature

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Biology
In test tube baby

Fertilization of ova takes place in test tube which development of embryo occur in uterus
Fertilization takes place in uterus while development takes place in test tube
Fertilization of ova and development takes place in test tube
Development of ova take place in test tube without fertilization

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