Introduction to Animals Worksheet
Circle the correct response.
1. Animals are [ heterotrophs / autotrophs ]
2. [ All / Most ] animals are multicellular.
3. The cells in the skin of your hand are [ bigger than / the same size as ] the cells in your heart.
4. Organisms that have 2 copies of each chromosome are [mobile / diploid ]
5. The absence of a cell wall allows animals [ mobility / diploidy ]
6. A hollow ball of cells that forms after fertilization is called a [ blastula / mesoderm ]
7. In all animals except [ humans / sponges ] a zygote undergoes divisions to become a blastula.
8. The cells of animals are organized into functional units called [ blastula / tissues ]
|9. ______ Ectoderm||a. lining of the digestive tract, digestive organs
|10. ______ Mesoderm||b. outer layer of skin and sense organs
|11. ______ Endoderm||c. most of the skeleton, muscles Match the body plan to its description|
|12. ______ radial||d. body that is irregular shaped
|13. ______ bilateral||e. has a distinct right and left half
|14. ______asymmetry||f. body parts arranged around a central axis, like the spokes of a bicycle wheel|
What symmetry do these animals have?
17. Segmented animals are constructed from a series of repeating units called [segments /vertebrates]
18. Evidence of segmentation in human beings can be seen in the [ skin / backbone ]
Match the name of the Phylum to the organism:
b. segmented worms
e. sea stars
|19. _____ Cnidaria
20. ______ Mollusca
21. _____ Annelida
22. _____ Chordata
25. ______ Porifera
Animal Body Systems
For each term below, indicate what body system it relates to. Body Systems
|28. Gastrovascular Cavity ___________________________
29. Ganglia ____________________________
30. Hermaphrodite ____________________________
31. Blood vessels ____________________________
32. Exoskeleton ____________________________
35. Nerve Net ____________________________
36. Hydrostatic ____________________________
37. Gametes ____________________________
38. Flame cells
40. trachea & spiracles
Revised from : www.biologycorner.com