Answer Posted / Dharmraj Yadav
The evolution of sori (plural of sorus) in pteridophytes is a significant step in plant evolution, marking the transition from spore-bearing structures on leaves (fruiting bodies) to specialized structures enclosed within modified leaves (sporangia). The development of sori represents an adaptation to protect developing spores from environmental factors such as drying and herbivory.
1. Evolution of indusium: An indusium is a leaf-like structure that covers and protects the sorus in many fern species. Indusium formation allowed for the development of sori on upper leaf surfaces, away from direct sunlight and rain, enhancing spore survival.
2. Evolution of specialized structures: Over time, some pteridophytes developed complex structures such as false indusia (pseudoindusia) or modified leaves (frondlets) to protect the sori. These adaptations improved spore dispersal and increased reproductive success.
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