निम्नलिखित में से कौन सी संरक्षण विधि विशेष रूप से नमक, तेल या सिरके का उपयोग करके ऐसी स्थितियाँ बनाती है जो सूक्ष्मजीवों की वृद्धि के लिए अनुपयुक्त हैं?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?