Explanation:

On 26th November, 71st constitution day was celebrated in the country. Every year as part of the celebrations, a number of activities aimed at highlighting and reiterating the values and principles enshrined in the Constitution are organised.
Facts about the Constitution of India:

• The framing of the Constitution took over 2 years, 11 months and 18 days.
• The original copies of the Indian Constitution weren’t typed or printed. They have been handwritten and are now kept in a helium-filled case within the library of the Parliament.
• Prem Bihari Narain Raizada had written the unique copies of the Structure of India.
• Originally, the Constitution of India was written in English and Hindi.
• The Constitution of India has borrowed some of its features from a number of countries, including Britain, Ireland, Japan, USA, South Africa, Germany, Australia, and Canada.

The basic structure of the Indian Constitution stands on the Government of India Act, 1935.
World’s lengthiest Constitution

• Federal System with Unitary Features
• Parliamentary Form of Government

The Constitution (104th Amendment) Act,2020: It extended the reservation of seats for SCs and STs in the Lok Sabha and states assemblies.

Hence only statement 1st is correct.