The steps the scientist used to set up the pitfall trap are shown below - Edexcel - GCSE Biology Combined Science - Question 3 - 2020 - Paper 1
Question 3
The steps the scientist used to set up the pitfall trap are shown below.
The steps are not in the correct order.
1. put some sand around the beaker
2. put a beaker, ... show full transcript
Worked Solution & Example Answer:The steps the scientist used to set up the pitfall trap are shown below - Edexcel - GCSE Biology Combined Science - Question 3 - 2020 - Paper 1
Step 1
Complete the steps in the correct order, from left to right.
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Answer
put a beaker, baited with food, in the hole
put some sand around the beaker
place a flat stone on pebbles over the beaker
check the pitfall trap each day
dig a hole in the garden
Step 2
Complete the table by filling in the tally and number for the spiders and worms.
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Answer
Invertebrate Summary
Invertebrate
Tally
Number of Invertebrates
Ant
TTTTTT
6
Beetle
TTTTTTTTTT
10
Slug
TT
2
Snail
TTT
3
Spider
TBD
TBD
Worm
TBD
TBD
Step 3
State how the type of food used to bait the pitfall trap could affect the number of different invertebrates caught.
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Answer
Different types of bait may attract different species of invertebrates.
For example, sweet foods like fruit might attract ants and slugs, while protein-based baits might attract predatory invertebrates such as spiders. The diversity of food and its relevance to the possible invertebrates in the habitat will influence the catch.
Step 4
Describe how the scientist can use this information to estimate the number of snails in the garden.
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Answer
The scientist can calculate the average number of snails found in each 1m² area, then multiply this average by the total garden area (40m²).
For example, if the average count from four samples is 10 snails per 1m², the estimate for the garden would be:
