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HIA International — Grade 6

Unit 1: Cells and organisms

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Unit 2: States of matter, atoms and compounds

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Unit 3: The Solar System and energy

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Unit 4: Living organisms and classification

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Unit 5: Metals, non-metals, acids and alkalis

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Unit 6: Sound, the Earth and eclipses

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Unit 7: Microorganisms and food webs

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Unit 8: Chemical reactions

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Unit 9: Electricity and circuits

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Quiz

Checkpoint Grade 6 Unit 4 – 4.4 Using Keys

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Using Keys Checkpoint Biology quiz: free practice for Cambridge Checkpoint Biology 0893. Work through this Using Keys Checkpoint Biology quiz and get instant feedback on every answer. If you get stuck, review the 2.4 Using keys lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 46
  • Passing grade: B+
  • Time limit:
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1.
Which statement best expresses the lesson objective about Using keys?
Use a dichotomous key to identify an organism
The terms branching key and dichotomous key are always interchangeable
Evidence is unnecessary when studying Using keys
Every model is an exact copy of reality
2.
Which practical work belongs to Using Keys?
Use evidence to discuss why viruses sit at the boundary between living and non-living
Use reproductive evidence and observable features to compare organisms
Apply the seven characteristics to living, non-living and once-living examples
Follow paired-choice questions accurately and check identification against observable features
3.
Which term is described as: a key in which every step offers exactly two alternatives?
dichotomous key
qualitative feature
quantitative feature
route
4.
Checking an identification against a description is _____.
classification
estimation
construction
verification
5.
Features that change with the seasons make the best key questions. - True or false?
True
False
6.
Match the term to its correct meaning: ambiguous
a feature described in words, such as 'has wings'
having more than one possible meaning, which makes a key step unreliable
a key in which every step offers exactly two alternatives
a feature given as a number, such as 'six legs'
7.
Which statement correctly describes verification?
checking an identification against a description or another source
a feature described in words, such as 'has wings'
a feature given as a number, such as 'six legs'
the sequence of steps followed through a key to reach a name
8.
Amira dips a net into a school pond and catches an animal with no legs and a coiled shell. She uses the branching key in the diagram. Which name does the key give?
Dr Dabour Hub Academy - figure 1
Pond snail
Water boatman
Leech (no shell)
Freshwater shrimp
9.
Hassan says the question "Does it have exactly eight legs?" could be removed from this pond key to make it shorter. Is he right?
Dr Dabour Hub Academy - figure 2
Yes – every animal in a pond has either six legs or no legs at all
Yes – a key only needs one question for each branch that has legs
No – without it the water mite and the freshwater shrimp would end at the same point
No – a key must always contain exactly five questions
10.
Class 6B lift a log and draw the four animals P, Q, R and S shown in the diagram. Use the numbered key in the table. Which animal is the woodlouse?
Dr Dabour Hub Academy - figure 3
Animal P
Animal Q
Animal R
Animal S
11.
Chloe collected the four leaves A to D shown in the diagram. She uses the key in the table to name leaf C. Which route does she follow and which name does she reach?
Dr Dabour Hub Academy - figure 4
1b, 2a – ash
1b, 2b, 3b – laurel
1a – pine tree
1b, 2b, 3a – oak
12.
Nadia wrote the key in the diagram to identify three kinds of caterpillar on a cabbage plant. Which is the best evaluation of her key?
Dr Dabour Hub Academy - figure 5
It is a good key because it reaches all three names with one question
It only needs changing to a numbered key to become reliable
It is not dichotomous and uses colour, which can vary within one kind
It is dichotomous because every answer ends in a name
13.
Thirty learners each used the same key on five specimens. The bar chart shows how many reached the correct name. The only step that separates Snail A from Snail B asks "Is the shell dark?". What is the best conclusion?
Dr Dabour Hub Academy - figure 6
The shell step is unreliable, because only about half chose correctly for the two snails
The key is unreliable for every specimen, because nobody scored 30 out of 30 overall
Snails are too small to be identified with any key
The learners did not start at the first step for the beetle
14.
Omar counts the legs on the specimen in the diagram. The key he is using starts with "It has exactly six legs / It does not have exactly six legs". What should he do?
Dr Dabour Hub Academy - figure 7
Choose "not six legs", because only five whole legs can be seen
Stop using the key, because keys only work on living animals
Skip step 1 and begin at a later step of the key
Count the stump as a leg and choose six legs, because a leg has broken off
15.
Pedro is finishing the branching key in the diagram. A clover leaf has three leaflets and a rose leaf has five or seven. The best question to write in the empty box is: _____
Dr Dabour Hub Academy - figure 8
Is it a clover leaf?
Does the leaf have exactly three leaflets?
Is the leaf small?
Is the leaf bright green?
16.
Using the garden key in the diagram, how many questions must Lina answer to identify a bee?
Dr Dabour Hub Academy - figure 9
Three questions
Five questions
Four questions
Two questions
17.
In the garden key shown, the ant and the ladybird are sent in different directions by the question "Does it have wings?". True or false?
Dr Dabour Hub Academy - figure 10
True – the ant goes down No and the ladybird down Yes
False – they are separated by the six-legs question
False – they are separated by the wing-case question
False – the key cannot tell them apart at all
18.
On a rocky shore, Kofi finds an animal stuck to a rock under a single cone-shaped shell. Using the key in the table, which route does he follow?
Route 1a, 2a
Route 1b, 3a, 4a
Route 1a, 2b, 4b
Route 1a, 2b, 4a
19.
Three groups used the same key on the same four specimens. Their results are in the table. The two snails in the key are separated by the step "The shell is brown / The shell is not brown". What is the most likely reason for the disagreement?
Group 2 used a different specimen from the other groups for every animal
Shell colour varies and is judged differently, so groups chose different statements
Snails cannot be identified with a key because they have no legs
The key gave the wrong names for the ladybird and the spider
20.
Yusuf used the key in the table and reached the name "gull". Which description must be true of the bird he looked at?
It has webbed feet and a flat, broad beak
It has feet with sharp talons and a hooked beak
It has webbed feet and a beak hooked at the tip
It has feet that are not webbed and a cone-shaped beak
21.
Farida examined 10 beetles, all of the same species, before writing a key step for them. Her results are in the table. Which feature is the most reliable to use in a key?
Number of legs, because it was the same for all 10 beetles
Body length, because it can be measured in millimetres
Colour of wing cases, because most of them were black
Where found, because most were under stones
22.
Ravi used the key in the table on an animal from leaf litter and wrote his route as "1a, 2b, 3a → beetle". What is wrong with his record?
Nothing – a beetle does have more than six legs
He should have started at step 5 because beetles live in leaf litter
Statement 1a sends him to step 3, not step 2
Statement 2b sends him to step 4, so he could not have reached 3a
23.
A class tried two ways of naming the same 20 insect specimens. Their results are in the table. Which conclusion is best supported?
The photo book is better because it was quicker for every specimen
The key was slower but gave far more correct names, so it is more reliable
Both methods are equally good because each named at least half
The key is better because it was both quicker and more accurate
24.
Grace wrote the key in the table in June. These four trees drop their leaves in autumn. Grace says: "My key will work just as well to identify the trees in January." True or false?
True – the trees are the same species all year round
True – a key never depends on the time of year
False – every step asks about leaves, which are missing in winter
False – the trees change species in winter
25.
In a dichotomous key, one step may offer three choices if the organisms fall into three clear groups. True or false?
True – three choices make the key shorter
False – every step offers exactly two choices
True, but only for plants
True, but only in a numbered key
26.
In a numbered key, the two statements in a pair should be opposites so that every organism fits one of them. True or false?
True – each organism must match exactly one statement
False – both statements can match the same organism
False – the second statement is optional
True, but only at the first step
27.
After naming her first minibeast, Sofia starts the second one at the step where she finished the first. True or false: this is the correct way to use a key.
True – it saves time to carry on
True, but only if the two animals look alike
False – she should start at the last step
False – each new organism must start again at step 1
28.
A key may give a wrong name when used on a photograph, because a question may ask about a feature the photo does not show. True or false?
False – photos always show every feature
False – keys only work on photographs
True – you should picture the whole organism
True, but only for photos of plants
29.
Mei is writing a key and uses the step "It was found on a plant / It was found on the ground". True or false: this is a good feature for a key.
True – it is easy to see where it was
False – where it was found is not a feature of the organism
True – animals always stay in one place
True, but only for animals with wings
30.
The same key can be drawn as a branching diagram or written as numbered pairs of statements, and both lead to the same names. True or false?
False – only the branching style is dichotomous
False – numbered keys need more organisms
False – they always give different names
True – they are two layouts of the same questions
31.
Reading back through your route after reaching a name is a waste of time, because a key can never give a wrong name. True or false?
False – a wrong choice at any step leads to a wrong name
True – keys are always correct
True, but only for numbered keys
False – you should read the key backwards from the start
32.
In a numbered key, statement 3b always sends you on to step 4. True or false?
True – steps are always followed in number order
True, but only if 3a sends you to a name
False – you go wherever the statement tells you
False – 3b always sends you back to step 1
33.
Male and female blackbirds are different colours. A key step "Is the bird brown?" could send them to different names even though they are the same species. True or false?
False – all members of a species are the same colour
True – colour can differ within one species
False – keys do not work for birds
True, but only if the birds are young
34.
A key allows someone who is not an expert to identify an organism. True or false?
False – only scientists can use keys
False – a key only tells you the group
True, but only after learning every species
True – they only need to answer simple questions
35.
The word "dichotomous" in dichotomous key means _____.
branching into two
having many choices
using colour pictures
arranged in number order
36.
A dichotomous key separates 12 kinds of ground beetle so that each ends up alone at a name. The key contains _____ questions.
exactly 12
exactly 6
exactly 11
exactly 24
37.
Ali examines a tiny springtail before using a key. He uses a hand lens so that he can _____.
make the animal grow larger
find out where it was living
change the colour of the specimen
count its legs and see its features clearly
38.
Features are often chosen for keys because of how reliable they are. Which pairing is correct?
Size – good, because it stays the same all through life
Number of legs – good, because it can be counted and does not change
Colour – good, because all members of a species look identical
Where it was found – good, because animals never move
39.
Each animal is paired with a feature a key could use to reach its name. Which pairing is correct?
Insect – has exactly eight legs
Earthworm – has a coiled shell
Spider – has exactly eight legs
Slug – body is made up of rings
40.
Each key step is paired with two animals it would separate. Which pairing is correct?
Has a shell / has no shell – snail from slug
Six legs / more than six legs – slug from earthworm
Has wings / has no wings – spider from woodlouse
Body in rings / not in rings – ladybird from bee
41.
Each stage of using a key is paired with its purpose. Which pairing is correct?
Starting at step 1 – saves time by skipping easy steps
Choosing one of two statements – you may choose both if unsure
Following the go-to number – always returns you to the start
Reading back through the route – checks that the name is right
42.
Why do biologists usually use a key rather than just comparing an organism with pictures in a book?
Pictures in books are always drawn wrongly
The organism may not be in the book, or the picture may be at a different angle
A key shows a photograph of every species on Earth
A key tells you where the organism lives
43.
Two snail species in a garden look very alike. Which step would be the most reliable one to separate them in a key?
The shell is large / the shell is small
The shell is pretty / the shell is plain
The shell has more than five turns / five turns or fewer
The snail is on a leaf / the snail is on a wall
44.
Zara wants to identify an earthworm. Because it obviously has no legs, she starts at step 3 of the key instead of step 1. Why is this a poor method?
She skips earlier steps and may reach a name the key never meant for it
Earthworms can only be identified from step 5
Keys must be read from the last step upwards
Starting at step 3 makes the key have more questions
45.
A key separates two moth caterpillars using "The body is longer than 3 cm / The body is 3 cm or shorter". Why could this step give a wrong name?
Length cannot be measured in centimetres
Caterpillars never change length
The two statements are not opposites
Young caterpillars of the larger kind may still be shorter than 3 cm
46.
A key separates only a housefly and a dragonfly with "It has four wings / It has two wings". Kemi uses it on a crane fly, which has two wings. What happens and why?
The key names it dragonfly, because crane flies are large
The key names it housefly, because a key only works for the organisms it was made for
The key cannot be started, because crane flies have legs
The key names it correctly, because every fly has two wings
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Part of Unit 4: Living organisms and classification — see every lesson and quiz in this unit.
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