Transcript Pre-Lab Slide Show

INSECT MOUTHPART LAB
Insect Classification
• Kingdom – Animalia
• Phylum – Arthropoda
• Class – Hexapoda (Insects)
Characteristics of Arthropods
• They have an
exoskeleton.
• The appendages are
jointed.
• The hard outer covering
supports the muscles.
• The body is formed of
a number of segments.
Characteristics of Insects
Three Main Body Parts
Head
•One pair of antennae.
–tactile organs
• sense of touch
–olfactory organs
•sense of smell
Thorax
• Three pairs of legs.
– The thorax has three
segments.
– Each segment has one
pair of legs.
Note: Some larvae have leglike appendages on the
abdomen.
• Often one or two pairs of
wings.
– The wings are borne by
the second and/or third
of the thoracic segments.
Note: Some insects are
wingless.
Abdomen
• The gonopore (genital
opening) is at the
posterior end of the
abdomen.
• No appendages used for
moving on the abdomen
of adults (except in a
few primitive insects).
• Sometimes there are
some appendages at the
end of the abdomen.
Insect Mouthparts
Siphoning/Proboscis
Ex. butterfly
Sponging/Lapping
Ex. housefly
Piercing/Sucking
Ex. mosquito
Chewing
Ex. caterpillars
None
Ex. mayfly
Mouthparts Animation
http://www.cals.ncsu.edu/course/e
nt425/library/labs/external_anato
my/anatomy_mouthparts.html
The Scientific Method
1. Problem/Question
2. Research
3. Hypothesis
4. Experiment
5. Conclusion
6. Report Results
Problem / Question
• Which insect mouthpart absorbs the
largest volume of liquid in a given
period of time; siphoning,
piercing/sucking, or lapping?
Hypothesis
Which mouthpart do you think will
absorb the most liquid in 30 seconds?
• Sample: The Siphoning mouthpart will absorb
the most liquid in 30 seconds. Siphoning is a
lot like using a straw and liquid can be
obtained quickly using this method.
• DO NOT START A HYPOTHESIS WITH . . .
“I think”, “I predict” or “My hypothesis is”!
The Experiment
• Independent Variable: Type of mouthpart
• Dependent Variable: Volume of liquid
• Constants: What was kept consistent/same?
– List at least 5 factors.
• Control Group: N/A
• Experimental Group: Mouthpart types (3)
Other Experimental Factors
• Materials
– How much? Use metric units.
• Procedure
– List numerically. Be detailed.
• Results: Data Table
– Used to organize data.
• Results: Graph
– Used to visualize and analyze data.
– Bar/column graph, line graph or pie chart
Data Collection
Data Table: Volume of liquid absorbed in 30 seconds.
Lab Group
1
2
3
4
5
6
Siphoning (ml)
Piercing (ml)
Sponging (ml)
Data Analysis
(Sample Data Table)
Siphoning (mL)
Piercing (mL)
Sponging (mL)
Individual
Average
12
8
28
Period
Average
14
11
31
Team
Average
9
10
27
Data Analysis
(Sample Graph)
Volume of Liquid (mL)
Volume of Liquid Absorbed
by Various Insect Mouthparts in 30 Seconds
35
30
25
20
15
10
5
0
Individual Avg.
Period Avg.
Siphoning
Piercing
Mouthpart
Sponging
Team Avg.
Analysis & Conclusion
• Make a statement revealing whether the data collected
provided support for or against the hypothesis.
• Explain the data collected including specific numerical or
observational data from the experiment.
• Provide a reasonable explanation for the data and
attempt to make connections based on the data collected.
• What future experiments could be done based on the
data collected or how could the experiment be extended
to collect more data?