A scientist investigated the distribution of invertebrates found in a garden - Edexcel - GCSE Biology - Question 4 - 2020 - Paper 1
Question 4
A scientist investigated the distribution of invertebrates found in a garden.
(a) Figure 9 shows an invertebrate about to fall into a pitfall trap.
The steps the sc... show full transcript
Worked Solution & Example Answer:A scientist investigated the distribution of invertebrates found in a garden - Edexcel - GCSE Biology - Question 4 - 2020 - Paper 1
Step 1
Complete the steps in the correct order, from left to right
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Answer
dig a hole in the garden
put a beaker, baited with food, in the hole
place a flat stone on pebbles over the beaker
check the pitfall trap each day
put some sand around the beaker
Step 2
Complete the table by filling in the tally and number for the spiders and worms
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Answer
invertebrate
tally
number of invertebrates
spider
IIIII
5
worm
IIII
4
Step 3
State the probability that the invertebrate selected is an ant
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Answer
The probability of selecting an ant is rac{6}{30}, which simplifies to rac{1}{5}.
Step 4
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
One type of food may only attract some invertebrates; other foods may attract many different types of invertebrates.
Step 5
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 mean number of snails observed in the four 1m² areas and then multiply that average by the total area of the garden, which is 40m².
