"The problem before us is to have democracy we have it politically ... and we need to expand it in the economic field also" -- Who said it

The main objective of the Directive Principles of State Policy is to 

Match the List I crop with List II of major producer and select the correct answer using the codes given below :

In which Prevention and Control of Pollution Act, the noise is defined as Air Pollutant

Which of the following soil is developed under the tropical monsoon climate

Who introduced the concept of hot spot in biodiversity