Chapter11: Health Of Aquatic Animals
Section: Chapter Questions
Problem 5KA
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Question
Transcribed Image Text:c) Sketch your regenerating part for each fragment.
d) What is the regenerating portion called?
e) What are the stem cells in Planaria called? What is their function?
f) Discuss behavioral response (movement, response to touch, light) observed for the tail
fragment which is regenerating a new head.
g) Discuss behavioral response (movement, response to touch, light) observed for the head
fragment which is regenerating a new tail.
h) How do you think Planaria actually DO the regeneration? What might be
happening to their cells? How might regeneration be possible?
Transcribed Image Text:Experimental Planaria #1
Cut in half inte front (anterior) and rear (posterior)
Day t
Measuring the Planaria
This operation is best performed by removing some of the water from the dish into the lid with a clean
pipette and waiting for the worm to stretch out. Measure the length of the worm in millimeters. (Aways
replace the water right away, you can use the dish lid to transfer water to and from the pianaran
environment.)
A. Record the length of the front (anterior) section jusAFTED you cut. This is your
INITIAL front length: 5m 6)
B. Record the length of the rear (posterior) section just AF TERGU cut. This is your
INITIAL rear length: mro
C. Observe and record any behavioral responses just after your cut
Day 2
Spend time under the microscope observing the cut Planaria. Answer the following
questions based on your observations. NO measurements will be taken on this daL.
a) Are the cut fragments showing signs of regeneration?
b) How did you identify the regenerating portion? What color does it look like?
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