Bisexual
Having both male and female reproductive organs; hermaphroditic.
Biting
Causing a stinging sensation; nipping: biting cold.
Bivalve
Having a shell consisting of twohinged valves.
Bivalent
A pair of homologous, synapsed chromosomes associated together during meiosis.
Blade
The broad, expanded photosynthetic part of the thallus of a multicellular alga or a simple
plant.
Blastocoel
The fluid-filled cavity that forms in the center of the blastula embryo.
Blastocyst
An embryonic stage in mammals; a hollow ball of cells produced one week after fertilization
in humans.
Blastodisc
Disklike area on the surface of a large, yolky egg that undergoes cleavage and gives rise to
the embryo.
Blastopore
The opening of the archenteron in the gastrula that develops into the mouth in protostomes
and the anus in deuterostomes.
Blastula
The hollow ball of cells marking the end stage of cleavage during early embryonic
development.
Blood
A type of connective tissue with a fluid matrix called plasma in which blood cells are
suspended.
Blood flukes.
A blood fluke species related to schistosoma haematobium which lives in the blood of host
like human
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