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Question

Spirogyra differs from moss protonema in having

A
Pyrenoid
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B
Branched filament
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C
Discoid chloroplast
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D
Rhizoidal branches
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Solution

The correct option is A Pyrenoid
Protonema are the algae-like filamentous structures that represents the juvenile gametophyte of most mosses and liverworts except Hornworts. This is a thread like chain of cells that forms the haploid phase of the bryophyte life cycle. While the Spirogyra filament is very similar to protonema, it is consists of a cell wall and protoplast. The protoplast consist of ribbon shaped chloroplast with row of pyrenoids.
Therefore, the correct answer is option A.

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