How does dugesia know its direction to move?

1. How do the platyhelminthes move?
2. What direction does the planarian move in?
3. What structure does dugesia use for circulation?
4. Why do Planaria move away from touch?
5. How does the dugesia obtain oxygen?
6. In what way does the phylum Platyhelminthes differ from the phylum Cnidaria?
7. How do Planaria sense light?
8. Does Planaria move toward or away from food?
9. Where do planarian worms live?
10. What are Dugesia found?
11. Is Dugesia and Planaria same?
12. Why do Planaria prefer the dark?
13. Why are Planaria used for research?
14. What is the position of nervous system in planaria?

How do the platyhelminthes move?

Movement in some flatworms is controlled by longitudinal, circular, and oblique layers of muscle. Others move along slime trails by the beating of epidermal cilia. The development of directional movement is correlated with cephalization. ... Most flatworms can reproduce sexually or asexually.

What direction does the planarian move in?

To capture prey animals, the planarian moves from place to place. It does this in one of two ways. The planarian has opposing muscles, circular muscles that extend around the flatworm and longitudinal muscles that extend from anterior to posterior of the flatworm.

What structure does dugesia use for circulation?

The mesenchyme cells serve to transport digested food and excretory wastes; in fact they perform the function of circulatory system of higher animals as this system is wanting in flatworms.

Why do Planaria move away from touch?

Because the planarian moved away from the light source, it exhibited negative phototaxis. Additionally, when touched on both its posterior and anterior ends with a pipette tip, the planarian attempted to move away from the tip, exhibiting sensitivity to touch.

How does the dugesia obtain oxygen?

The planarian does not have gills or lungs, it obtains its oxygen by simple diffusion over its flat body. The dugesia cannot survive outside of the water, so biologists studying it must make sure that the specimen has plenty of water that is aerated. The dugesia does have an excretory system to remove wastes.

In what way does the phylum Platyhelminthes differ from the phylum Cnidaria?

Cnidarians are diploblastic, whereas Platyhelminthes are triploblastic. Platyhelminthes possess bilaterally symmetrical, soft, worm-like elongated bodies, whereas cnidarian possess radially symmetrical, soft, medusa-like or polyp-like body forms. ... Cnidarians have cnidocytes, unlike the Platyhelminthes.

How do Planaria sense light?

Planarians sense visible light through their cerebral eye. On the other hand, UV light sensing (extraocular) is dispersed throughout the planarian body. In a competition experiment, the aversive response through the cerebral eye appears to be dominant.

Does Planaria move toward or away from food?

Does the planaria move toward or away from the light? Planaria exhibits negative phototaxis, moves away from the light. ... Planaria senses the presence of food by tasting the water around it for compounds released by nearby food using its auricles which are chemoreceptors. Planarians lack specialized gas exchange organs.

Where do planarian worms live?

Planaria (Platyhelminthes) are free-living flatworms that live in freshwater. They are typically found under rocks and debris in streams, ponds, and springs. Planarians are interesting to study for a variety of reasons.

What are Dugesia found?

Dugesia (pronounced, /duˈd͡ʒiʒ(i)ə/) is a genus of dugesiid triclads that contains some common representatives of the class Turbellaria. These common flatworms are found in freshwater habitats of Africa, Eurasia, and Australia.

Is Dugesia and Planaria same?

Two common names for freshwater macroturbellarians are triclads and planarians. These include Dugesia and Planaria, which are widely used in high school and college science classes to study simple behavior and tissue regeneration.

Why do Planaria prefer the dark?

Planaria prefer the dark, as evidenced by the observation that they will move away from the light and to a dark side of the dish.

Why are Planaria used for research?

Planarians are used in many kinds of research, in part because they have some fascinating characteristics relating to reproduction, regeneration, and cell memory. ... Research attributes these amazing regenerative abilities to the retention of pluripotent stem cells, which can grow back into anything.

What is the position of nervous system in planaria?

The planarian CNS is located on the ventral side of the body, and composed of a mass of cephalic ganglions in the head region and a pair of ventral nerve cords (VNC).