Answer
Lysenko's agricultural theories, based on Lamarckian principles rather than Mendelian genetics, contributed to the devastating famines in the Soviet Union, particularly during the 1930s. His erroneous beliefs and influence within the Soviet leadership led to disastrous farming practices, such as rejection of crop rotation and adoption of unscientific methods, resulting in widespread crop failures and mass starvation. The tragic famines that ensued claimed the lives of millions of people.