Question

pata, Hydra Sketch the Hydra Label tentacles, mouth Answer Questions 1. What type of symmetry do Hydra exhibit 2. What body form does the hydra have 3. Name the stinging cells on the surface of the tentacles. B. Data, Planaria (Dugesia) Sketch the Planaria Label the eyespots, pharynx Questions Answer 1. How do planarians move? Place a piece of white paper half way under the petri dish, leaving the other half over the black table. Wait for several minutes. 2. Where are most of the planarians found? 3. What does your answer in question 2 suggest in terms of how they respond to their environment? Try feeding a planarian a small bit of liver. 4. How does the planarian detect the food? 5. Describe how feeds. the planarian

Answer 1

1.The Symmetry that is exhibited by hydra is Radial symmetry, we know that hydra is a cinadaria and the classic symmetry exhibited by the cnidarians are radial symmetry,

2.The body form of hydra is polyp. There are 2 main types of body forms found in the cnidarians the polyp and the medusoid form hydra is the polyp where as the jelly fish exhibit the medusa fomr.

3.The stinging cells in the surface of the cnidarians is known as NEMATOCYST.

1. The locomotory organs that are present in the planarians is the cilia they move by the beating of the cilia present in their ventral dermis and these beating movements causes them to glide across the surface of the mucus.

2. The planarians belong to the class Tubuleria of the flatworms of the genus Platyhelminthis. They are mostly free living are are found in the ponds and fresh water bodies.