Biology
Plants are killed in winter by frost

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

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Biology
The main function of the inner bark of a woody plant is to

Protect the plant from herbivorous animals
Act as a membrane impermeable to water and gas
Transport minerals and water from the roots to the leaves
Transport food from the leaves to the other parts of the plant

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