Final answer:
Successfully growing yams is not a sign of strength and manliness.
Step-by-step explanation:
No, successfully growing yams is not a sign of strength and manliness. The cultivation of crops, like yams, is a result of agricultural practices and domestication by various peoples around the world. The Niger-Congo peoples of West Africa, for example, actively cleared land and planted crops including yams, oil palm, peas, groundnuts, and a uniquely African variety of rice. Growing these crops requires knowledge of agricultural techniques and does not have any inherent connection to personal strength or characteristics of masculinity.