BIOLOGIA (PAKISTAN) ISSN 0006-3096 BIOLOGIA (PAKISTAN) Vol. 59, No.2, 2013 Editor-in-Chief Dr. AZIZULLAH EDITORS PAKISTAN FOREIGN Nusrat Jahan Jonathan Palmer (New Zealand) Ghazala Yasmeen Athar Tariq (U.S.A.) Ikram-ul-Haq C.J. Secombes (U.K.) M. R. Mirza B. Faye (France) A.U.Khan Salih Dogan (Turkey) Zaheer-ud-din Khan Wolfgang Von Engelhardt (Germany) M.Sharif Mughal Qi Bin Zhang (China) BIOLOGICAL SOCIETY OF PAKISTAN Biological Laboratories, GC University, Lahore, Pakistan www.biosoc.pk