Table of Contents
- 1 What sensory organs do flatworms have?
- 2 Where are the sensory organs of the flatworm located?
- 3 Are there any sensory organs evident in Ascaris?
- 4 Are flatworms vertebrates?
- 5 What is the excretory organ of Ascaris?
- 6 Which of the following is a difference between flatworms and roundworms?
- 7 Where are the light sensitive spots on a flatworm?
- 8 Why are planarians and flukes called flatworms?
- 9 What kind of excretory system does a flatworm have?
What sensory organs do flatworms have?
They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots. The head region of the flatworm has other paired sense organs connected to the flatworm’s simple brain.
Where are the sensory organs of the flatworm located?
Members of the Phylum Platyhelminthes (especially true of the planarians, Class Turbellaria) are organized with brain and sense organs at the front of the animal. This is called cephalization. In animals with cephalization, the sense organs come in contact with the environment first.
Are there any sensory organs evident in Ascaris?
Q: Is there any evidence of sensory organs in Ascaris? A: Both of the worms are parasitic, with no sensory organs, only posessing digestive and reproductive organs.
Do flatworms have sense organs?
Flatworms have prominent eyespots. These constitute the flatworm’s most prominent sensory organs. However, while the eyespots resemble eyes, the organs are much more simple. Instead, the eyespots can only tell light from dark.
How many types of nervous systems and sense organs are found in flatworms?
Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and two nerve cords, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body.
Are flatworms vertebrates?
Flatworms are invertebrates in Phylum Platyhelminthes. Flatworm adaptations include mesoderm, muscle tissues, a head region, and bilateral symmetry.
What is the excretory organ of Ascaris?
In Ascaris, the excretory system consists of one or two large renette gland cells. A kidney is the excretory organ and mainly found in chordates in different forms, but true kidney found in mammals.
Which of the following is a difference between flatworms and roundworms?
Note: Both flatworms and roundworms can be parasitic or free living….What is the difference between flatworms and roundworms?
| Flatworms | Roundworms |
|---|---|
| They do not have a body cavity and thus are acoelomates. | They are pseudocoelomates i.e. they have a body cavity between their mesoderm and endoderm layers. |
How are roundworms different from flatworms?
Note: Both flatworms and roundworms can be parasitic or free living….What is the difference between flatworms and roundworms?
| Flatworms | Roundworms |
|---|---|
| They have a thin, dorsoventrally flattened body, so called flatworms. | They have a long cylindrical body, vermiform, unsegmented with no lateral appendages. |
Do flatworms have a central nervous system?
The bilaterally flattened body of flatworms preserves a common organization of the central nervous system (CNS). The CNS of flatworms consists of: (i) the orthogon, composed of main longitudinal nerve cords and transverse commissures that form a ladder-like network.
Where are the light sensitive spots on a flatworm?
The anterior or head end of the flatworms has a concentration of sensory structure. Two light sensitive eye-spots are located at this end.
Why are planarians and flukes called flatworms?
Explain why planarians and flukes are called flatworms. They are called this because their dorsal and ventral sides are flat. Parasitic fluke and tapeworm One opening Two way digestive system. The anterior or head end of the flatworms has a concentration of sensory structure.
What kind of excretory system does a flatworm have?
Flatworms have an excretory system with a network of tubules throughout the body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body. The system is responsible for regulation of dissolved salts and excretion of nitrogenous wastes.
How are flatworms an example of bilateralism?
Associated with bilateralism is the beginning of cephalization, the evolution of a concentration of nervous tissues and sensory organs in the head of the organism, which is where the organism first encounters its environment. The flatworms are acoelomate organisms that include free-living and parasitic forms.