Question: I am a computer science student. I studied C, then came to C++[an object oriented one] and now Java[More Object Oriented]. My question is whether 'C' language is of any importance these days? Did I study it for the sake of studying the languages in the order in which they were developed so as to understand languages step by step?

Is there things that can be done only with C? What is it's scope?

Answer: 
The main scopes are: 

* drivers
* operating systems
* systems where performance is critical
* small embedded systems (thanks Joachim)
C is still heavily used in situations where otherwise one would drop down to assembler, since it's one of the few structured languages to let users code that close to the hardware.

And a lot of what claims to be C++ code is C code with an OOP wrapper.