Planaria space free-living flatworms that live in quiet ponds or body of water. In some areas you have the right to even record a couple of planarian by attaching a item of liver to a fish hook and a sinker and dropping it into the water. Wait a couple of minutes and also pull the liver out and you may find tiny small black worms feasting on the meat. Like all flatworms, planaria belong come the Kingdom Animalia, and also the Phylum Platyhelminthes. This phylum additionally contains helminth flatworms, choose the tapeworm and also the liver fluke.

Free-living flatworms like the planaria are grouped into the course Turbellaria. The most common varieties studied in the rap is the brown planaria, Dugesia. The animal has one acoelomate body (no interior cavity to host organs), no anus and lacks a circulatory system. Many are scavengers and also will eat other animals that have sank to the bottom of your ponds, thus why you have the right to use liver to record them.

The Dugesia does have a an easy nervous mechanism that has a ganglia situated in that anterior an ar to serve as a brain. Together such, the dugesia exhibits the properties of cephalization, whereby the majority of its feeling organs are located in the anterior region. It has actually a triangle head through two influential eyespots. ~ above closer investigate of the eyes, you deserve to see that they have a curious cross-eyed expression to them. The visibility of the 2 eyes and lateral horns on the head indicate that the planarian has actually bilateral symmetry.

The planarian will swim in a shallow petri food by undulating its body across the surface ar of the dish. Most will continue to be close come the bottom or the edge of the dish. If provided a choice, the planarian will proactively seek an area of the dish that is dark or has actually some sort of cover. The eyespots can in fact, detect alters in irradiate in the planarian"s environment. If friend shine a flashlight ~ above the planarian, it will certainly attempt to relocate out of the light.

The planarian go not have actually gills or lungs, that obtains the oxygen by an easy diffusion over its flat body. The dugesia cannot survive outside of the water, so biologists examining it need to make sure that the specimen has plenty the water the is aerated. The dugesia does have an excretory system to eliminate wastes. Tiny cells, referred to as flame cells, line the lateral edge of the biology and function to remove waste.

The dugesia deserve to reproduce sexually, and all dugesia space hermaphrodites. 2 dugesia will certainly pair up and fertilize every other"s eggs. Those eggs room then exit in a cocoon. If there is not one more dugesia present, one have the right to reproduce asexually through a process called transverse fission. The organism will certainly pull chin in half and the tail section will regenerate a new head, and also the head section will regenerate a brand-new tail. This procedure can it is in replicated in the rap by making use of a razor blade or scalpel to reduced the dugesia in half. In a couple of weeks, you should have actually two dugesia swimming about in her petri dish.

QUESTIONS

___1. What kind of symmetry walk the dugesia have? a) radial b) bilateral c) asymmetry

___2. What term is supplied to explain how a planarian deserve to regrow its human body parts? a) rebirth b) fission

___3. Which of the complying with is connected with the planarian"s concerned system? a) flame cell b) ganglia

___4. Asexual reproduction can happen through a procedure called: a) transverse fission b) binary fission

___5. A hermaphrodite is an pet that: a) deserve to asexually give birth b) deserve to regenerate c) has actually both male and also female parts

___6. The dugesia belongs to the phylum: a) platyhelminthes b) planaria c) turbellaria

___7. How can a person capture a dugesia?a) using a net to siphon them from the surface ar of the water b) using a hook and raw liver to tempt them

___8. An animal that has actually no internal body cavity to organize organs is dubbed a(n): a) hermaphrodite b) acoelomate

___9. Just how does the dugesia acquire oxygen? a) diffusion b) v gills c) through its flame cells

___10.


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The dugesia will often tend to remain in what areas? a) dark b) irradiate c) warm


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