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 s... 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
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
tally
number of invertebrates
ant
III
6
beetle
10
slug
snail
III
3
spider
worm
Step 3
State the probability that the invertebrate selected is an ant.
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Answer
The probability that the invertebrate selected is an ant is given by the formula:
P(ant)=total number of invertebratesnumber of ants=306=51
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
Different types of food may attract different invertebrates; for example, some foods may only attract certain types, while others may attract a wider variety 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 per area by averaging the counts from the four 1m² areas, then multiplying this average by the total number of 40m² in the garden.
