Biology
The individual chain of cells or filament in the colony of Nostoc is known as

Hormogonia
Trichome
Heterocyst
None of these

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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

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

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