Biology
Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with

only angiosperms
angiosperms and all gymnosperms except conifers
all gymnosperms, except conifers
only conifers

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Biology
Plants are killed in winter by frost

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

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