Which one of the following is a correct statement?
- Pteridophyte gametophyte has a protonemal and leafy stage.
- In gymnosperms, female gametophyte is free-living.
- Antheridiophores and archegoniophores are present in pteridophytes.
- Origin of seed habit can be traced in pteridophytes.
Answer
(4) Origin of seed habit can be traced in pteridophytes.
Solution
(1) Protonemal and leafy stages belong to the gametophyte of mosses, not of pteridophytes (prothallus) ⇒ incorrect.
(2) In gymnosperms the female gametophyte is retained within the megasporangium (ovule) ⇒ not free-living ⇒ incorrect.
(3) Antheridiophores and archegoniophores occur in the liverwort Marchantia ⇒ incorrect.
(4) As per NCERT, heterosporous pteridophytes ( Selaginella, Salvinia) retain the female gametophyte on the parent sporophyte; this event is a precursor to the seed habit ⇒ correct.
Answer: (4)