Botany A minute opening in the ovule of a seed plant by which the pollen tube generally gets in.
Zoology A pore into the membrane covering the ovum of some creatures through which a spermatozoon can enter.
In seed-bearing flowers, a little orifice in the integuments associated with ovule by which sperm are able to access the ovum.
An opening within the membranes surrounding the ovum, by which diet is assisted together with entrance of this spermatozoa allowed.
An opening in outer coat of a seed, whereby the fecundating pollen enters the ovule.
In botany, the orifice or channel inside coats for the ovule ultimately causing the apex of this nucleus, through which the pollen-tube penetrates.
In zoology: The scar or hilum of an ovum at point of its attachment on ovary
Any opening when you look at the coverings of an ovum whereby spermatozoa may access the interior, or a cluster of minute skin pores on top of an egg whereby fertilization is effected. From the eggs of lepidopterous insects these skin pores frequently form a rosette at one end.
In zoology: using sporozoans, a moment opening inside oöcyst through which the microgamete enters to fertilize the macrogamete.
small orifice in the wall of an ovule by which the pollen pipe comes into