hypodermis of pteris rhizome is made up of :
the cells of the annulus in pteris are thickened on
total number of cells in one posterior ventral and anterior ventral sex organs of pteris prothallus respectively are :
there are 100 antheridia in the prothallus of pteris . 25% of androcytes in each antheridium got degenerated.hoe many spermatozoids are expected to be formed ?
the neutral prothalli of pteris reproduce by: