निम्नलिखित जैव अणुओं में से कौन सा प्राथमिक पादप कोशिका भित्ति में पाया जाने वाला सबसे प्रचुर संरचनात्मक घटक 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?