Lab 4 Pre-lab assignment- Shubh
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LAB 4 PRE-LAB ASSIGNMENT
ANIMAL DIVERSITY
NAME: Shubh Chand
ID #: 100864979
CRN: 70008
LAB 4 PRE-LAB ASSIGNMENT is due ANY TIME BEFORE the start of your lab!
YOU NEED TO COMPLETE THE PRE-LAB ASSIGNMENT AND SEND AN ELECTRONIC COPY
through the assignment submission on Canvas BEFORE the start of the lab.
Submissions after
the start of the lab are not going to be accepted and will receive a ZERO for the preparation of
the lab!!!! Late submissions will not be accepted. It is recommended that you work on the
pre-lab well before the due date and submit the pre-lab at least 1 hour before the start of the
lab to ensure that you do not encounter any technical issues. Do not leave it until the last
minute.
You need to upload a pdf, doc or docx file as an assignment submission in Canvas. Here are the steps
to upload a file as an assignment submission in Canvas. To upload:
1.
Open Assignments. In Course Navigation, click the Assignments link (or go directly to BIOL
1020 lab folder and access the appropriate assignment from this folder).
2.
Select the assignment. Click the title of the assignment.
3.
Submit Assignment. Click the Submit Assignment button.
4.
Add File. ...
5.
View Submission. Check submission is complete and correct.
NOTE: use the space provided in the boxes below to answer the questions. Please do not
write outside of the boxes and do not modify the box sizes, as your answers will NOT be
graded out of this range. Try to be concise and specific with your answers and complete the
assignment in your own words.
**Utilize the necessary online resources for your research but please answer
questions in your own
words!**
BIOL1020 Pre-lab Assignment 4
1
EXERCISE 4.1:
Anatomy of a Freshwater Mussel
1.
Answer the following questions about mussels.
(a)
What is the role of the mantle?
(b)
What is the role of the muscular foot?
(c) What are the functions of the incurrent (ventral) and excurrent (dorsal) siphons?
(d)
What is the haemocoel?
(e)
Describe the composition of a bivalve shell.
bivalve shells consist of three layers:
1. The nacreous layer - the smooth iridescent inner layer of the shell and is composed of alternating layers
of calcium carbonate and organic matter
2. The prismatic layer - the thickest, middle layer which is made of a mix of calcium carbonate and
organic materials
3. The periostracum - the outer layer, which is made primarily of protein.
The mantle secretes proteins and minerals to form the shell.
The muscular foot is used to anchor the mussel or to allow movement through the underlying
substance.
Water enters through the incurrent siphon, circulates within the mussel, and is expelled through
the excurrent siphon.
The haemocoel is the primary body cavity in mussels, which contains circulatory fluid.
BIOL1020 Pre-lab Assignment 4
2
EXERCISE 4.2:
Anatomy of a Fish
1 (a) How many chambers are present in a fish heart?
1
(b)
What is the function of the lateral line?
(c)
In ray-finned fishes, the swim bladder is a modification of what structure?
Explain how fish use
their swim bladder to regulate buoyancy.
EXERCISE 4.3:
Anatomy of a Crayfish
1.
Answer the following questions about arthropods.
(a)
How do crayfish excrete waste?
(b)
Crayfish belong to the group Ecdysozoa. What is the one major characteristic that is unique
to this group?
(c)
What three characteristics of arthropods have contributed to their success?
1.
Segmentation
The lateral line aims to detect movements and pressure changes in the surrounding water.
Fish will fill their swim bladders with air to rise or release air from the swim bladder to sink.
Crayfish can excrete wastes through blood circulation.
All members share the characteristic of ecdysis.
BIOL1020 Pre-lab Assignment 4
3
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