Explanation:

• Rajya Sabha (Council of States) is the Upper House of the Union Parliament of India. Unlike the U.S. Senate, the Upper House of India’s Union Parliament is not constituted on the basis of equal representation to all states. Seats are allotted in proportion to the population of people of each State or Union Territory. However, one-third Members of Rajya Sabha retire after every second year. A member who is elected for a full term serves for a period of six years.
• Rajya Sabha can’t be dissolved, but yes, it can be abolished. Bicameral legislature is not a part of Basic Structure. It is well within the powers of Parliamentarians to abolish Rajya Sabha if they can muster the 2/3rd majority in both the houses i.e. a constitutional amendment.
• Further more, Federal Structure is a part of Basic structure. But it can exist in Unicameral structures also as in France and also if you want an indigenous example…..majority of states in India. (Some do have an upper house. It is more about existing choices and needs). The onus will be on judiciary to see whether it is wrong or right in Indian setting