Q.

Protonema is:

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a

Haploid and is found in mosses

b

Diploid and is found in liverworts

c

Diploid and is found in pteridophytes 

d

Haploid and is found in pteridophytes

answer is A.

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Detailed Solution

Protonema is a creeping, green, branched and frequently filamentous stage. It is a haploid, independent, gametophytic stage in the life cycle of mosses. It is produced from the spores and gives rise to new plants. Examples – Funaria, polytrichum 

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Protonema is: