Q1. Describe the biological rhythm in non-chordates.
- Biological rhythms are endogenous cycles synchronizing non-chordate biology with environmental changes.
- Circadian rhythms (approx. 24h) govern daily activities like insect eclosion and cockroach foraging.
- Circatidal rhythms (approx. 12.4h) synchronize intertidal organisms, e.g., shore crab activity.
- Circalunar rhythms (approx. 29.5 days) influence reproduction, like Palolo worm spawning.
Answer: Biological rhythms are endogenous cyclical patterns of biological activity that synchronize an organism's physiology and behavior with environmental cycles. In non-chordates, these rhythms are crucial for survival, reproduction, and optimizing resource utilization, adapting them to predictable environmental changes like day-night cycles, tidal movements, and seasonal shifts. The LSE-09 course emphasizes understanding these diverse temporal adaptations across various invertebrate phyla. One prev...