Ọnụ ọgụgụ germination dị ezigbo mma Nchọpụta ọnụego germination Nyochaa ọnụego germination Nleba anya nnwale nke ọnụego germination Ogo-nleba anya-Ngwaọrụ5 ọka pollen Mkpụrụ osisi pollen Ụlọ nyocha