First slide

Pteridophytes

Question

Which of the following are heterosporous pteridophytes?
I. Pteris
II. Selaginella
III. Equisetum
IV. Marsilea

Moderate

A

I and II only
B

II and III only
C

III and IV only
D

II and IV only

Solution

Heterospory is the occurrence of two kinds of spores, i.e., smaller microspores (producing male gametophyte) and larger megaspores (producing female gametophyte) in the same plant. Heterospory arose in pteridophytes first. It is common in eight genera of pteridophytes which are Selaginella, Isoetes, Marsilea, Salvinia, Azolla etc.

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