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Question

A green alga having fixed number of cells in it's thallus is called

A
Coenobium
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B
Daughter cell
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C
Heterocyst
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D
Harmogonia
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Solution

The correct option is A Coenobium

A.Coenobium – A green alga having fixed number of cells in it’s thallus is called Coenobium.

B.Daughter cell – Cells formed from parent cell

C.Heterocyst - A specialized cell found in nitrogen-fixing cyanobacteria. Heterocysts are enlarged cells with thick cell walls and they lack chlorophyll, giving them a colourless appearance. They are the site of nitrogen fixation, for which they produce the enzyme nitrogenase.

D.Harmogonia - motile filaments of cells formed by some cyanobacteria in the order Nostocales and Stigonematales. They are formed during asexual reproduction in unicellular, filamentous cyanobacteria, and some may contain heterocysts and akinetes.

So, the correct option is ‘Coenobium’.

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