Difference Between Primary and Secondary Protonema

Protonema is defined as a thread-like chain of cells. The major difference between the primary and secondary protonema is that primary protonema is developed from the spores whereas, secondary protonema is developed from other structures like rhizoids, stem and so on.

Primary protonema is only responsible for the germination of spore while secondary protonema is responsible for the whole development of the gametophytic part of the plant.

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