Biology 2
Assignment 3:
Name: ________________
Use Ohiolink to obtain a copy of the following article:
Roberto Guidetti∗, Tiziana Altiero, Roberto Bertolani, Pasqualina Grazioso, Lorena Rebecchi.
2011. Survival of freezing by hydrated tardigrades inhabiting terrestrial and freshwater
habitats. Zoology 114 (2011) 123-128.
Answer the following questions:
1. Using 2-3 sentences, describe a tardigrade?
2. Incdicate where a tardigrade fits in the animal kingdom by the following criteria?
a. acoelomate, pseudocoelomate or coelomate
b. bilateral symmetry or radial symmetry
c. protostome or deuterostome
d. ecdyzoan or non-ecdyzoan
e. diploblastic or triploblastic
3. To which phylum do tardigrades belong?
4. What are cryptobiosis and cryobiosis?
5. What was the overall purpose of this research?
6. Identify the following:
Independent variable (1):
Dependent variables (2):
Number of species used in research:
Substrates on which they were found:
Geographical location of study:
7. What were the conclusions:
a. Which species were able to survive freezing?
b. What was the relationship between freezing rate and survival?
c. In what habitat are species that survive freezing normally found?
8. What questions do you have after analyzing this article? (None is not an acceptable
answer.)