Which of the following is true for selaginella_______. *
(a) Main plant body is gametophyte
(b) The prothalli are unisexual
(c) The plant is homosporous
(d) Sporangia are in sori
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Answer:
Correct option is
B
Prothallus
The main plant body of Pteridophytes is the sporophyte. They reproduce asexually by forming spores in sporangia. The plants may be homosporous, i.e., produce only one type of spores (e.g., Lycopodium, Pteridium) or heterosporous i.e., produce two different types of spores, smaller microspores and larger megaspores (e.g., Selaginella, Marsilea etc.).
The spores germinate to produce haploid gametophyte, called as prothallus. The homosporous Pteridophytes produce bisexual (monoecious) gametophytes, whereas heterosporous one produce unisexual (dioecious) gametophytes.
Hence the correct option is B.
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