| Animals of phylum Platyhelminthes are commonly known as | Flatworms |
| Describe their body shape | They have dorsoventrally flat body |
| How many germ layers are there in Platyhelminthes | They are triploblastic, means they have three germ layers |
| Which kind of coelom is present in Platyhelminthes | They are acoelomates. |
| How is their body symmetry | They have bilateral symmetry |
| "Mostly Platyhelminthes are endoparasite" then what is the exception | Dugesia (planaria) is free living. |
| Life cycle of taenia solium | Tenia solium is also called for Pork tapeworm. |
| Life cycle of fasciola hepatica | Fasciola hepatica is commonly known as liver fluke. |
| What are the uses of circus in fasciola | Oral suckers and ventral suckers helps in attachment to bile duct of liver of sheep and also helps in food intake. |
| Describe about head of taenia. | Head contain two rows of hooks and for Muscular structures
- upper part in head of taenia is called rostellum and it contains two rows of hooks
- strobilla is made up of many cells called proglottids. |
| In which Platyhelminthes digestive system is absent. | In Taenia- digestive system is absent because it directly absorb digested food of human beings through its body surface. |
| How these animals protect themselves from digestive juices of the host? | These animals have a thick outer layer called "tegument" it protects those animals from the digestive juices of the host. |
| What help in excretion in these animals? | Flame cells (solenocytes)
-Protonephridia contains many flame cells. |
| What are parasitic adaptations in Platyhelminthes? | 1.Hooks helps the parasite to get attached to small intestine of host.
2. Suckers help in attachment and food ingestion.
3. Thick tegument protects the parasite from adhesive enzymes of host.
4. Taenia can observe food directly through body surface. |
| Which kind of nervous system is there in such animals. | They have ladder like nervous system. |
| "Platyhelminthes are hermaphrodite" explain this statement. | It means that Platyhelminthes are bi sexual both male and female reproductive organs are present in the same animal.
But schistoma (blood fluke) is an exception- female lives in gynaecophoric Canal. |
| What kind of fertilization and development is there in Platyhelminthes | They have internal fertilization and indirect development. |
| Which is the smallest tapeworm? | Echinococcus dog tapeworm |
| Which is the largest tapeworm? | Taenia saginata beef tapeworm is the largest tapeworm.
Rostellum and hooks are absent in taenia saginata. |
