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Question
During unfavourable conditions, the sponges form
During unfavourable conditions, the sponges form
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Solution
The correct option is D Gemmule
Fresh water sponges, such as Spongilla as well as some marine forms, such as Ficulina, Suberites and Tethya possess the remarkable ability to produce specialised bodies called as gemmules, which help to survive during unfavourable conditions and germinate to produce new sponges. A fully formed gemmule is a small hard ball having a mass of food laden archaeocytes enclosed in a double layered tough envelope with amphidisc spicules in between. There is a small opening the micropyle through which the cells come out during development in favourable conditions.
Hence the correct option is D.
Fresh water sponges, such as Spongilla as well as some marine forms, such as Ficulina, Suberites and Tethya possess the remarkable ability to produce specialised bodies called as gemmules, which help to survive during unfavourable conditions and germinate to produce new sponges.
A fully formed gemmule is a small hard ball having a mass of food laden archaeocytes enclosed in a double layered tough envelope with amphidisc spicules in between. There is a small opening the micropyle through which the cells come out during development in favourable conditions.
Hence the correct option is D.
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