Multicellular fragment of a blue green alga capable of growth into new plant is

Hormocyst

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Trichome

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Trichogyne

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Hormogonium

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Solution

The correct option is D Hormogonium
Cyanobacteria are blue-green algae which are capable of photosynthesis. They are able to fix atmospheric nitrogen. They reproduce asexually. The commonest mode of reproduction is fragmentation. The short pieces of filaments are called hormogones. These hormogones are also called as hormogonium. They are capable of growth into new filamentous cynobacteria.
Thus, the correct answer is 'Hormogonium.'

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