FUNGI AND HELMINTH Flashcards
THEY ARE MULTICELLULAR EUKARYOTIC ANIMALS THAT GENERALLY POSSESS DIGESTIVE, CIRCULATORY, NERVOUS, EXCRETORY AND REPRODUCTIVE SYSTEMS.
HELMINTHS
THEY CAN ABSORB NUTRIENTS FROM THE HOST’S FOOD, BODY FLUIDS AND TISSUES.
THEY MAY LACK A DIGESTIVE SYSTEM
They do not need an extensive nervous system because they do not have to search for food or respond much to their environment. The environment within a host is fairly constant.
THEIR NERVOUS SYSTEM IS REDUCED
they are transferred
from host to host, they don’t need to search actively for a suitable habitat.
THEIR MEANS OF LOCOMOTION IS OCCASIONALLY REDUCED OR COMPLETELY LACKING
Individuals produce large numbers of eggs, by which a suitable host is infected.
THE REPRODUCTIVE SYSTEM IS OFTEN COMPLEX
The life cycle of parasitic helminths can be extremely complex, involving a succession of _____ for completion of each larval (developmental; asexual) stage of the parasite
INTERMEDIATE HOST
a ______for the adult
parasite (sexually mature form).
DEFINITIVE HOST
Adult helminths may be dioecious; male reproductive organs are in one individual, and female reproductive organs are in another. In those species, reproduction occurs only when two adults of the opposite sex are in
the same host.
Dioecious
Adult helminths may also be ______- – one animal has both male and female reproductive organs. Two hermaphrodites may copulate and simultaneously fertilize each other. A few types of hermaphrodites fertilize themselves.
monoecious, or hermaphroditic
