Question

Phylum Platyhelminthes (flatworms)

1. Observe live planaria

1. Are planaria free living or parasitic?              ____________________________

2. Which class do planaria belong?                     ___________________________

   

3. Do planaria have body cavity?                        ___________________________

4. What kind of symmetry do planaria show?      ___________________________

5. Planaria have only one opening (mouth only), what kind of body plan do they have?           

                                                                                      __________________________   

2. Examine flukes (Clonorchis sinensis).

1. Are flukes free living or parasitic?                    __________________________

2. Which class do they belong?                             __________________________

3. Examine tapeworm (Taenia pisiformis).

1. Which class do tapeworms belong?                     _________________________

2. How does a tapeworm attach to the host’s intestinal wall? _________________

3. What is each section of the tapeworm called and what does it primarily contain?       

________________________________________________________________

4. Do tapeworms contain digestive systems? Why? _________________________

5. Which term is used to describe each animal containing both male and female reproductive organs?              

                                                                                     __________________________

Phylum Nematoda (roundworms)

1. Observe a dissected Ascaris.

1. What kind of body plan does an Ascaris have?          _____________________

2. What kind of body cavity does it have?                      _____________________

3. What does the body cavity contain?           ______________________________

4. Is Ascaris free living or parasitic?                              _____________________

5. Are roundworms hermaphroditic?                              _____________________

2. Observe live vinegar eel (watch video).

1. Are vinegar eels free living or parasitic?                     _____________________

2. Observe the movements of vinegar eels.

Sketch a few specimens in the space below.

________________________________________________________________

Answer 1

For live planaria -

a - Free living

a - Rhabditophora

a - No

a - bilateral symmetry

a - bilateral symmetry

For Flukes

a - Parasitic

a Trematoda

For tapeworms

a - Cestoidea

a - With the help of its head ( scolex ), it attaches to the intestinal wall

a - The body is primarily divided into head ( scolex ) which consists of hooks and suckers , a neck, and a series of segmented region called proglottids which bears the male and female sex organs.

a - Tapeworms do not have digestive systems

a - Hermaphrodite

For Ascaris

a - Bilateral symmetry with a simple body plan

a - Pseudocoelom - false body cavity

a - Pseudocoelom consists of protein rich pseudocoelomic fluid and carries five giant mesenchyme cells known as pseudocoelomocytes that occupy fixed positions in the anterior third of the body.

a -Obligate parasytic

a - not hermaphrodite

For vinegar eels

a - Free living