Science 12C Flashcards
- (True or False) The planarian is a parasitic flatworm.
False (its free living)
An invertebrate (like a worm) can have one or more simple brain. The brain is called a ______?
Ganglion
- Planarians can reproduce sexually, because they are _______? They can also reproduce asexually by this process ______?
Hermaphrodite
Regeneration
- What phylum includes the roundworms?
a. Annelida c. Nematoda
b. Platyhelminthes d. Cnidaria
c. nematoda
Most flatworms are not free living, they are _______?
They live inside other organisms called a _____?
Parasitic Hosts (they do not immediately kill the host)
What type of nerve runs down each side of a worms body and is connected to its ganglion?
Longitudinal
What nerves connect the longitudinal nerves, giving the whole system the look of a ladder
Transverse
Because a worm has a ganglion and longitudinal nerve system, it can react to ______?
(Changes in its environment like touch, light, water)
stimulus
Planarians (cross-eyed worms) have eyespots. The eyespots let them respond to light stimuli. Do they respond negative or positively to light? Why?
Negative. They can be eaten
A planarian eats by extending a muscular tube called the _____. It uses this mouth to suck food into the intestine.
Pharynx
After eating, the planarian gets rid of its waste through a system of tiny tubes. At the ends of these tubes are structures called _____ _______. The cells have cilia that move the waste water through the tubes to tiny holes called _____ ______.
Flame cells
excretory pores
See photo
This worm can be found in the intestines of various animals.
Ascaris. (Scary)
What type of symmetry does a planarian have?
a. radial c. asymmetrical
b. longitudinal d. bilateral
D. Bilateral
