Question

Give economic importance of pteridophytes & gymnosperms.
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Answer 1

Answer:

The strong root system of gymnosperm prevents soil erosion.  Few gymnosperms are 'Living Fossils' (Cycas, Ginkgo) they provide important scientific knowledge about the past flora of earth.  Some Gymnosperms, particularly Conifers, are good sources of fuel-wood.

It's an economically valuable species which is used as a bio fertilizer. Since Azolla leaves contains symbiotic cyanobacteria that are able to convert atmospheric nitrogen to nitrate. Some members of pteridophytes are noxious weed like Salvinia, Pteridium which are weedy aquatic ferns.

Explanation:

Answer 2

Economic importance of pteridophytes & gymnosperms:

• It's an economically valuable species which is recycled as a bio fertilizer.
• Since Azolla leaves included symbiotic cyanobacteria that can transfer atmospheric nitrogen to nitrate.
• The strong root system of gymnosperm avoid soil erosion.
• Few gymnosperms are 'Living Fossils' (Cycas, Ginkgo) they give important scientific knowledge about the past flora of earth.  
• Some Gymnosperms, particularly Conifers, are rich sources of fuel-wood.
• Since Azula leaves holds symbiotic cyanobacteria that can change atmospheric nitrogen to nitrate.
• Some members of pteridophytes are noxious weed like Salvinia, Pteridium which are weedy aquatic ferns.

To know more:

Differentiate between pteridophytes and gymnosperms​

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