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a
Presence of adventitious root system.
b
Homosporous condition
c
Retention of female gametophyte in the megasporangium even after fertilisation
d
Development of dimorphic gametophytes.
answer is C.
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Detailed Solution
Prior to the formation of seed the megasporangium retains the femlae gametophyte enven after fertilisation and embryo development in certain speices of Selaginella.