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Biology Achieved 3.1

In: Science

Submitted By Loganello
Words 370
Pages 2
Biology 3.1 Internal

Introduction:
Porcellio scaber or the slater, as it is commonly called, belongs to the Isopoda order and is a part of the arthropod class Crustacea. Where most Crustacean relatives of the slater are marine, such as the water flea or the lobster, slaters have become fully terrestrial with seven pairs of legs and a flat, segmented body which they can roll up in for safety.
P. scaber is commonly found in New Zealand despite being native to Europe. Slaters tend to live in dark, damp and enclosed environments, preferring moderate temperatures. Examples of this kind of habitat are the inside of a rotting log, beneath decaying leaf litter or in caves.
Purpose:
The purpose of this experiment is to investigate the responses of P. scaber to different air humidity levels.
Hypothesis: The slaters will respond positively to humid conditions.
Null Hypothesis: humidity will have no effect on the slaters and their responses

Equipment: * 3 Petri Dishes * Craft Knife * Masking Tape * Blu-Tac * Silica Gel Packets * Cotton Wool * 15 Slaters * Stopwatch/Timing Device * Pen & Paper

Final Method:
(Experiment conducted in a room with constant light source and temperature) 1. Get 3 Petri Dishes, cut 2 holes in one and 1 hole in the others, make the hole about 1cm wide 2. 3
2
1
Tape Petri dishes together, aligning the holes so that you end up with a 3 compartment choice chamber 3. Leave the middle chamber (chamber 2) as a control with nothing in it 4. In chamber 1, fasten a packet of silica gel to the top of the chamber using blu-tac, this absorbs the moisture from the air 5. In chamber 3, fasten some cotton wool soaked in 30 mL of water to the top of the chamber using blu-tac, this puts moisture into the air 6. Place 5 slaters in each chamber 7. Place lids on the Petri dishes and begin timing 8. Record the number of slaters in each chamber every 5 minutes for half an hour 9. Put results into table format
TEST AVERAGES
Results:

No. of Slaters

Time (minutes)

As the graph shows, slaters showed a positive response to the chamber which had the higher humidity level

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