1 An organ is a collection of different tissues that carries out a particular function (e.g. liver). 2  An organ system is a collection of organs that functions to carry out a specific task in the organism (e.g. digestive system).  At each level of organization, the structure helps determine the function.
Shivalik Express: Toy Train to Shimla. The best way to reach Shimla is to travel by Toy train from Kalka. The railway track is small in width between Kalka and Shimla and is known as meter gauge track opened by British Government in the year 1903. The distance of 96 KM between Shimla and Kalka passes through 102 tunnels and 87 bridges. There are more than 20 stations in this railway system which still uses the old Neales Token Instrument system for track interlocking. It connects Kalka at a height of 656 meter to Shimla at 2076 meter from mean sea level.
How to Reach Bhimtal. Bhimtal By Air :- The nearest airport to Bhimtal is at Pantnagar, During the summer regular flights are operational. the seat of a famous agricultural university, about 55 Kms from Bhimtal. Bhimtal By Rail :- The nearest railway station is at Kathgodam situated around 23 Kms away. Kathgodam is connected by rail directly with Delhi, the capital of India, Lucknow, the capital of the state of Uttar Pradesh, Dehradun the capital of the state of Uttarakhand and Calcutta.