Difference between primary and secondary protonema.

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Solution

Primary protonema is the basic part of this chain which is formed from a space.
Secondary protonema develops from any adult part of the plant.
Primary protonema Secondary protonema
The first stage in the life cycle of moss.
The intermediate stage between primary protonema and leafy stage.
2. Responsible for the germination of spore. 2. Responsible for the development of the gametophytic part of the plant.
3. It is developed from the spores. 3. It is developed from other structures like rhizoid and stem.

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Primary protonema	Secondary protonema
The first stage in the life cycle of moss.	The intermediate stage between primary protonema and leafy stage.
2. Responsible for the germination of spore.	2. Responsible for the development of the gametophytic part of the plant.
3. It is developed from the spores.	3. It is developed from other structures like rhizoid and stem.