3
Question
Development of prothallus from sporangial stalk of a fern is an example of
Development of prothallus from sporangial stalk of a fern is an example of
Open in App
Solution
The correct option is D Apospory
In normal life cycle the diploid sporophyte generation produces haploid spores by meiosis. The haploid spores germinate to produce haploid gametophyte which produces haploid gametes by mitosis. The gametes fuse through the process of syngamy to form diploid zygote. The diploid zygote gives rise to diploid sporophyte. In apospory the gametophyte (prothallus in case of ferns) develops directly from sporophyte without the involvement of haploid spores. In apogamy the sporophyte develops directly from gametophyte without involvement of gametes or syngamy. Apomixis means substitution of normal sexual process (amphimixis) which does not involves meiosis and syngamy.
In normal life cycle the diploid sporophyte generation produces haploid spores by meiosis. The haploid spores germinate to produce haploid gametophyte which produces haploid gametes by mitosis. The gametes fuse through the process of syngamy to form diploid zygote. The diploid zygote gives rise to diploid sporophyte. In apospory the gametophyte (prothallus in case of ferns) develops directly from sporophyte without the involvement of haploid spores. In apogamy the sporophyte develops directly from gametophyte without involvement of gametes or syngamy. Apomixis means substitution of normal sexual process (amphimixis) which does not involves meiosis and syngamy.
Suggest Corrections
0
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
