Identify the pair of heterosporous pteridophytes among the following:

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Equisetum and Salvinia

Lycopodium and Selaginella

Selaginella and Salvinia

Psilotum and Salvinia

answer is C.

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Detailed Solution

Pair of heterosporous pteridophytes is Selaginella and Salvinia. They produce two different types of spores: microspores and megaspores, which develop into male and female gametophytes, respectively.

(1) Equisetum is a homosporous pteridophyte. Salvinia is a heterosporous pteridophyte. Therefore, Equisetum and Salvinia do not belong to the pair of heterosporous pteridophytes.

(2) Lycopodium is a homosporous pteridophyte. Selaginella is a heterosporous pteridophyte. Therefore,
Lycopodium and Selaginella do not belong to the pair of heterosporous pteridophytes.

(4) Psilotum is a homosporous pteridophyte. Therefore, Psilotum and Salvinia do not belong to the pair of heterosporous pteridophytes.

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