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Worksheet_Earthworm

1 Earthworm_Essay1_Function of Clitellum

TOPIC 1: What is the function of the clitellum?

2 Earthworm_Essay2_Dorsal vs. Ventral Sides

TOPIC 1: What external features allowed you to identify the

dorsal and ventral sides of the earthworm?

3 Earthworm_Essay3_Description of Earthworm Locomotion

TOPIC 2: Write your description of earthworm locomotion from

your records here.
4 Earthworm_Essay4_Prostomium during Movement

TOPIC 2: What is the prostomium doing while the earthworm is

moving?

5 Earthworm_Essay5_Labeled Cross Section Image(s)

TOPIC 3: Upload your labeled earthworm cross section slide

image(s) here.
6 Earthworm_Essay6_Typhlosole Structure vs. Function

TOPIC 3: How does the structure of the typhlosole relate to its

function?
7 Earthworm_Essay7_Labeled Earthworm Seta Image

TOPIC 3: Upload your labeled earthworm seta image here.
8 Earthworm_Essay8_Setae Location vs. Function

TOPIC 3: On which side of the earthworm are the setae

located? How does that placement relate to their function?
9 Earthworm_Essay9_Labeled Longitudinal Anterior Image

TOPIC 4: Upload your labeled earthworm longitudinal anterior

slide image here.
10 Earthworm_Essay10_Labeled Longitudinal Reproduction

Image

TOPIC 4: Upload your labeled earthworm circulatory and

reproductive systems longitudinal section slide image here.
11 Earthworm_Essay11_Earthworm Seminal Vesicles

TOPIC 4: If you were only able to observe seminal vesicles in

the slide, would that mean that the earthworm is male? Please

explain.
12 Earthworm_Essay12_Labeled Longitudinal Digestion Image

TOPIC 4: Upload your labeled earthworm digestive system

longitudinal section slide image here.
13 Earthworm_Essay13_Musculature of Crop vs. Gizzard

TOPIC 4: Do you see any differences between the musculature

of the crop and that of the gizzard? If yes, how does this

difference relate to the function of each?

14 Earthworm_Essay14_Labeled Earthworm Septa Image

TOPIC 4: Upload your labeled earthworm septa image here.
15 Earthworm_Essay15_Earthworms’ Ecosystem Contribution

CONCLUSIONS: How do earthworms contribute to the

ecosystem?
16 Earthworm_Essay16_Earthworm Segmentation Displays

CONCLUSIONS: What are two ways that earthworms display

segmentation?
17 Earthworm_Essay17_Benefit of Earthworm Color

CONCLUSIONS: Focusing on the color of earthworms, how

might this feature benefit the organism in its natural habitat?
18 Earthworm_Essay18_Internal Dorsal vs. Ventral Features

CONCLUSIONS: What internal features allow you to identify

the dorsal and ventral sides of the earthworm?
19 Earthworm_Essay19_Axis of Symmetry

CONCLUSIONS: The earthworm does not have large

appendages to display bilateral symmetry the way that, say, a

human has right and left arms. The earthworm has a bilateral

plan. This plan is easiest to visualize if you examine the

earthworm cross-section diagrams in the Background and

Procedures of the lab and observe the bilateral symmetry of the

interior organs.

In what direction does the axis of symmetry run? Think about

which cut-through of the animal will leave mirror-image halves.
20 Earthworm_Essay20_Earthworm Waste Excretion

CONCLUSIONS: What are the two methods that an earthworm

uses to excrete waste?
21 Earthworm_Essay21_Earthworm “Sensory Organs”

CONCLUSIONS: What is the closest an earthworm has to

sensory organs such as ears or a nose?
22 Earthworm_Essay22_Earthworm “Respiratory Organs”

CONCLUSIONS: Did you observe any respiratory organs, such

as lungs or gills, in any of the earthworm slides? Why or why

not?