मृदा संरक्षण की वह विधि जिसमें पौधों के बीच की अनावृत भूमि को पुआल जैसे जैविक पदार्थों की परत से ढक दिया जाता है, क्या कहलाती है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?