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Pteridophytes

Selaginella a...

Question

Selaginella and fern shares which of the following character?

A

Leptosporangiate sporangium

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B

Heterospory

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C

Absence of ovule

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D

Protostele cell

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Solution

The correct option is B Heterospory
Genera like Selaginella (club moss) and Salvinia (floating fern), produce two kinds of spores, macro (large) and micro (small) spores. This is called heterospory, as the spores are unequal.

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Q. Which of the following statement(s) is/are correct about pteridophytes?
(i) The main plant body is a sporophyte which is differentiated into true roots, stem and leaves.
(ii) The leaves are small (microphylls) as in ferns or large (macrophylls) as in Selaginella.
(iii) Genera like Selaginella and Salvinia which produce two kinds of spores–macro (large) and micro (small) spores, are known as heterospores.
(iv) Common examples are Funaria, Polytrichum and Sphagnum.

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