The Clock

Last week I had an urgent meeting at Thodupuzha, at 11Am In Idukki District, Which is of 7 hours journey from my home District. My train starts from Trivandrum at 5 o clock morning. I had forgotten to set my alarm but I woke up early at 3 o clock.Thanks to my biological clock in my body I could reach the destination in time. Plants and animals have the inbuilt mechanism of biological clock in them for their survival. In plants a bluish protein called phytochrome can sense the Light and can manifest light associated activities. Think of periodic activities exhibited by organisms.