उस स्थिति को क्या कहा जाता है जब -60 बार पर मिट्टी की नमी पौधों के लिए पूरी तरह से अनुपलब्ध हो जाती है और पौधे सूख कर मर जाते हैं?

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?