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Question 1 of 9
1. Question
Let’s start with some invertebrates and use a key to sort them out.




SNAIL WORM BEETLE HOVERFLY Use the ‘clue’ key below to work out which invertebrate matches which letter:
Clue 1 If the animal has legs go to Clue 3 If the animal has no legs go to Clue 2 Clue 2 If the animal has a shell Animal A If the animal has no shell Animal C Clue 3 If the animal has two wings Animal D If the animal has hard black wing cases Animal B Sort elements
- Animal A
- Animal C
- Animal B
- Animal D
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Snail is
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Worm is
-
Beetle is
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Hoverfly is
CorrectIncorrect -
Question 2 of 9
2. Question
This time, we have a selection of delicious cakes!






Here is a spider key which sorts out the cakes according to their characteristics – look through it first, to get an idea of how it’s put together, and then tackle the question at the bottom:

Use the key to find out which cake is brown in colour and has raisins in it.
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Question 3 of 9
3. Question
Next, we have a selection of liquorice allsorts:

Here is a ‘clue’ key to help sort them out. Look over it, to get an idea of how it works:
Clue 1 If the sweet has some black colour on it go to Clue 2 If the sweet has no black colour on it go to Clue 7 Clue 2 If the sweet is square go to Clue 3 If the sweet is round go to Clue 5 Clue 3 If the sweet has a brown layer Sweet G If the sweet does not have a brown layer go to Clue 4 Clue 4 If the sweet has a green layer Sweet D If the sweet has an orange layer Sweet E Clue 5 If the sweet has white in the middle Sweet H If the sweet has no white colour go to Clue 6 Clue 6 If the sweet has pink colouring Sweet B If the sweet has yellow colouring Sweet C Clue 7 If the sweet has pink colouring Sweet F If the sweet has blue colouring Sweet A You’re going to use the key to find out which round sweet has blue but not black colouring.
Remember, always start at Clue 1 and go from there, OK?
CorrectIncorrect -
Question 4 of 9
4. Question
Imagine that you’re designing a spider key to sort out some toys.
You have three toys with wheels that you want to sort out into two groups.
The two groups will be:
Toys with four wheels.
Toys with more than four wheels.



Digger Sports car Train Which of these branching keys would be correct for the three toys above?
CorrectIncorrect -
Question 5 of 9
5. Question
Here are five more toys, which we need to sort out into groups.
Let’s say that we’ve chosen the question “Does the toy have legs?” as the best feature to help split these toys into two groups:





Lego bricks Teddy Animal family figure Jigsaw Dinosaur Which of these spider keys would correctly split them into two groups of ‘legs’ and ‘no legs’?
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Question 6 of 9
6. Question
So, let’s put those eight toys together and give each one a name:




Bob Lewis James Henry 



Edward Flopsy Bosch Rex Now, all we need to do is to construct the full spider key to sort them out.

Now, use the key to find a toy which has no wheels or legs but does have straight edges.
CorrectIncorrect -
Question 7 of 9
7. Question
Next, we’ve got a selection of four sweets:




Sweet W Sweet X Sweet Y Sweet Z Our ‘clue’ key for these four sweets is as follows:
Clue 1: If the sweet is round in shape go to Clue 2 If the sweet if not round in shape go to Clue 5 Clue 2: If the sweet is brightly coloured go to Clue 3 If the sweet is not brightly coloured go to Clue 4 Clue 3: If the sweet comes on a stick Sweet Z If the sweet doesn’t come on a stick Sweet W Clue 4: If the sweet is hard to the touch Sweet Y If the sweet is soft and squidgy Sweet X You’re going to use this key to find one particular type of sweet.
So, starting at Clue 1, use the key to find the sweet which is round and soft, and not brightly coloured.
CorrectIncorrect -
Question 8 of 9
8. Question
In trying to sort out these four sweets, let’s imagine we’ve chosen to ask “If the sweet is brown in colour” as a characteristic of some sweets in this group.




Choc bar Teddy chews Liquorice Toffee
Which of these groups contains only brown sweets?
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Question 9 of 9
9. Question
Right, let’s finish with these eight sweets.
You have the ‘clue’ key to sort them out.
And, there’s one for you to find.




Sweet A Sweet B Sweet C Sweet D 



Sweet E Sweet F Sweet G Sweet H Clue 1: If the sweet is round in shape go to Clue 2 If the sweet is not round in shape go to Clue 5 Clue 2: If the sweet is brightly coloured go to Clue 3 If the sweet is not brightly coloured go to Clue 4 Clue 3: If the sweet comes on a stick Sweet F If the sweet is not on a stick Sweet B Clue 4: If the sweet is hard to the touch Sweet E If the sweet is soft and squidgy Sweet C Clue 5: If the sweet is brown coloured go to Clue 6 If the sweet is not brown coloured go to Clue 7 Clue 6: If the sweet is in a block you break Sweet A If the sweet is not in a block Sweet H Clue 7: If the sweet is shaped like a teddy Sweet D If the sweet is not shaped like a teddy Sweet G Right, final question.
Find the sweet that is not shaped like a teddy, and isn’t round or brown.
CorrectIncorrect