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Life Science
Life Science Chapter 15 Lesson D Review Questions
| Question | Answer |
|---|---|
| What type of symmetry does a planarian have? | bilateral |
| How many longitudinal nerves does a planarian have? | 2 |
| Where is the mouth on a planarian? | underside |
| What is the name given a simple brain of an invertebrate such as a planarian? | ganglion |
| Nerve cells are called | neurons |
| A ______________________ is something an organism can sense in its environment and respond to it. | stimulus |
| List four characteristics of animals in the phylum Platyhelminthes. | a. are flat and unsegmented; b. have bilateral symmetry; c. some are parasites; d. found in many places: oceans, freshwater and soil. |
| __________________________ symmetry is when you cut long ways and the two halves are equal and mirror images. | bilateral |
| List three characteristics of a planarian. | a. lives in fresh water; b. free-living; c. have simple organ systems |
| Are the eyespots of a planarian used to see images or to detect light? _________________________ | detect light |
| Describe the simple nervous system of a planarian. | A longitudinal nerve runs down each side of its body. A series of transverse nerves connects the longitudinal nerves. |
| Does a planarian have a circulatory system with blood? _______________ | no |
| How are the nutrients in a planarian transported to other cells in the body? ________________________________________________________________ | Food is moved throughout the intestine by the twisting movements of the planarian and by the flagella |
| How are oxygen and carbon dioxide exchanged in a planarian? ________________________________________ | Through the thinness of its body. |
| How does a planarian rid of its waste? ___________________________________ | Through a system of tiny tubes moving waste to the excretory pores |
| __________________ cells are special cells with cilia that help to rid the planarian of waste. | flame |
| Not permanently attached to an object | free living |
| Body symmetry in which one side is like a mirrored copy of the other side | bilateral |
| A simple brain | ganglion |
| Secretes digestive enzymes in the intestine | gastroderm |
| Removed by flame cells and excretory pores | waste |
| Long, thin cells that run through the body and carry impulses from place to place | neurons |
| A collection of neurons wrapped in protective coverings | nerve |
| Something an organism can sense | stimulues |
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halelk2