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Checkpoint Biology 0893

Grade 6 - Unit 1: Cells and organisms

0/11 Dr Dabour Hub Science Diagram and Course Material

Grade 6 - Unit 4: Living organisms and classification

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 6 - Unit 7: Microorganisms and food webs

0/11 Dr Dabour Hub Science Diagram and Course Material

Grade 7 - Unit 1: Breathing and respiration

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 7 - Unit 4: Ecosystems

0/10 Dr Dabour Hub Science Diagram and Course Material

Grade 7 - Unit 7: Nutrition, health and movement

0/10 Dr Dabour Hub Science Diagram and Course Material

Grade 8 - Unit 1: Cells and organisms

0/10 Dr Dabour Hub Science Diagram and Course Material

Grade 8 - Unit 4: Living organisms and classification

0/12 Dr Dabour Hub Science Diagram and Course Material

Grade 8 - Unit 7: Microorganisms and food webs

0/10 Dr Dabour Hub Science Diagram and Course Material
Quiz

Checkpoint Grade 8 Unit 4 – 4.5 Constructing Keys

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Constructing Keys Checkpoint Biology quiz set 2: free practice for Cambridge Checkpoint Biology 0893. Work through this Constructing Keys Checkpoint Biology quiz set 2 and get instant feedback on every answer. If you get stuck, review the 8.5 Constructing keys lesson. More practice: Cambridge Checkpoint Biology 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Which statement correctly describes branching key?
a key that gives two choices at each step
the process of determining what an organism is
an identification route displayed as branches
an observable characteristic
2.
Which statement correctly describes dichotomous key?
an identification route displayed as branches
the process of determining what an organism is
a key that gives two choices at each step
an observable characteristic
3.
Which statement correctly describes feature?
an identification route displayed as branches
a key that gives two choices at each step
the process of determining what an organism is
an observable characteristic
4.
Which statement correctly describes identification?
an identification route displayed as branches
a key that gives two choices at each step
an observable characteristic
the process of determining what an organism is
5.
Which of these is the FIRST step in the correct order?
choose a clear first split
write paired branches
test each identification route
list observable features
6.
Which step comes immediately after "choose a clear first split"?
list observable features
test each identification route
write paired branches
7.
Which practical work belongs to Constructing Keys?
Apply the seven characteristics to living, non-living and once-living examples
Use reproductive evidence and observable features to compare organisms
Use evidence to discuss why viruses sit at the boundary between living and non-living
Design, test and revise a key so that each branch is clear and unambiguous
8.
Grade 8 learners built the branching key in the diagram for six animals caught in a school pond. How many of the six animals need three questions to reach their name?
Dr Dabour Hub Science Diagram and Course Material
Two of the animals
Three of the animals
Four of the animals
All six of the animals
9.
Mei's key for the leaves in the diagram starts with "Is the leaf divided into separate leaflets?". Leaves A and F both answer yes. Which pair of statements should her next step use to separate them?
Dr Dabour Hub Science Diagram and Course Material
The leaf is larger / The leaf is smaller than the other one
It has three pairs of leaflets / It has two pairs of leaflets
The leaf is divided into leaflets / It is not divided at all
The leaflets are a dark green / The leaflets are a light green
10.
Sipho measured the wings of 15 adult dragonflies of each of two species (graph). He planned the step "Wing longer than 45 mm / wing 45 mm or shorter" to separate them. What is the best judgement about this step?
Dr Dabour Hub Science Diagram and Course Material
It is reliable, because every species A wing is below 45 mm
It is reliable, because a measured length is never an opinion
It is unreliable, because no wing on the graph is over 45 mm
It is unreliable, as the lengths overlap from 43 to 46 mm
11.
Two groups each built a key for the same eight garden bird species. The chart shows how many questions a user answers to reach each bird's name. Which conclusion is correct?
Dr Dabour Hub Science Diagram and Course Material
Both keys hold 7 questions, but Key Y never needs more than 3
Key Y holds fewer questions in total than Key X does
Key X is quicker than Key Y for every one of the birds
Key X must be wrong, as no key may need 7 questions
12.
Keys can identify objects as well as organisms. A technician uses the key in the diagram on a piece of glassware that has a flat base, no pouring lip and no scale marked all the way up. What is it?
Dr Dabour Hub Science Diagram and Course Material
It is a measuring cylinder
It is a conical flask
It is a narrow test tube
It is a glass beaker
13.
Rania's key in the diagram has one question box left blank (marked ?). Which question should go in that box?
Dr Dabour Hub Science Diagram and Course Material
Does it have wings?
Does it have a backbone?
Is it a type of mammal?
Does it have feathers?
14.
Kiri's first draft key uses only barbels and stripes, so fish P and R reach the same name, and so do Q and T. Using the table, which ONE extra feature separates both of these pairs?
Spines on the back fin
Small fatty fin near the tail
Whether it has barbels
Stripes along the body
15.
Ama's key begins "Is the body red?". The table shows her test results. What is the most likely cause of the errors, and the best fix?
Colour varies within the 2-spot species; use a stable feature such as spot number
The 2-spot is too small to see; use a hand lens on only that species
Twelve specimens is too few; test 100 of each species before changing it
The 7-spot confuses users; remove the 7-spot ladybird from the key
16.
Nour tests the key in the table on a centipede before giving it to her class. What happens, and what must she change?
She loops from 2b back to step 1; 2b should say "go to 4"
She reaches "spider"; 2a should say "has 6 legs" instead
She reaches "slug"; 3b should say "go to 4" instead of slug
She reaches "centipede"; the key works, so nothing needs to change
17.
Using the test results in the table, which conclusion about the two seed keys is best supported?
Key Q is better, because users answered more questions per seed
Neither is better, because both keys contain the same 7 questions
Key P is better: users need fewer steps and make fewer errors
Key P is better only because it contains fewer questions in total
18.
Lin wants her key to work all year. Using the table, which feature separates the frog from the stickleback in both April and August?
Whether it has a tail
Whether it has fins
Whether its throat is red
Whether it has four legs
19.
Using the table, which single question separates the mite from the other three arthropods in one step?
Does it have 8 or more legs?
Does it have antennae?
Does it have fewer than 3 body sections?
Is it the smallest of the four?
20.
Each arthropod group is paired with a leg count that could be used in a key. Which pairing is correct?
Insect – eight jointed legs
Myriapod – exactly six jointed legs
Arachnid – eight jointed legs
Arachnid – no jointed legs at all
21.
Each number of organisms is paired with the questions a user answers on EVERY route of a perfectly balanced key. Which pairing is correct?
8 organisms – 7 questions on every route
4 organisms – 3 questions on every route
16 organisms – 8 questions on every route
8 organisms – 3 questions on every route
22.
Each type of feature is paired with an example. Which pairing is correct?
Subjective feature – has eight jointed legs
Countable feature – number of pairs of leaflets
Observable feature – how pleasant the smell is
Measurable feature – the petals are a nice colour
23.
Each vertebrate group is paired with a key question that identifies it. Which pairing is correct?
Fish – Does it have fur on its body?
Amphibians – Does it have dry scaly skin?
Mammals – Does it have fins and gills?
Birds – Does it have feathers?
24.
Grace is building a key for nine seashells. Her first question separates one shell from the other eight. Why is this a poor choice?
Most shells will need many more questions to reach a name
It means the key will contain more than eight questions in total
A first question must always separate exactly one organism
Seashells cannot be put into a key, as they are not alive
25.
Omar is making a key to dried, pressed plant specimens in a museum. Which question can he use?
Does it grow best in the shade?
Are its flowers visited by bees?
Are the leaf edges toothed?
Does it wilt on very hot days?
26.
Kwame's key to ants asks "Does it have wings?". Worker ants have no wings, but a queen of the same species has wings when she first leaves the nest. What does this show about his question?
It is fine, as queens are never found in the field
It is fine, because wings are always easy to see
It fails, as winged insects can never be in keys
It fails, as the feature varies within one species
27.
Why should each step of a key ask about only one feature, rather than "Does it have wings AND antennae?"
Two features make the key contain fewer questions in total
An organism with only one of the two fits neither answer clearly
Keys may only ask about features that can be counted
Asking about two features makes every route much longer
28.
A housefly and a honeybee both have six legs and three body sections. Which pair of statements separates them in Nadia's key?
It has six legs / It does not have six legs
It is a fly / It is a bee
It is dangerous / It is harmless
It has one pair of wings / It has two pairs of wings
29.
What is the difference between USING a key and CONSTRUCTING a key?
Using picks the features; constructing only follows the questions set
Using is only done in the field; constructing is only done indoors
Using names an unknown; constructing picks features to split a known set
Using needs a numbered key; constructing needs a branching key
30.
A draft key to live bees and wasps includes "Does it sting when you hold it?". Why should this step be replaced?
Stinging can be counted, so it is better left as the last step
The test is unsafe and harms the insect; use a visible feature
Every bee and every wasp can sting, so all of them answer yes
The word "sting" is too long to fit into a branching key
31.
Which term is described as: an identification route displayed as branches?
dichotomous key
identification
branching key
feature
32.
Which term is described as: a key that gives two choices at each step?
branching key
identification
dichotomous key
feature
33.
Which term is described as: an observable characteristic?
branching key
identification
feature
dichotomous key
34.
Which term is described as: the process of determining what an organism is?
branching key
dichotomous key
feature
identification
35.
Kemi uses the numbered key in the table on a tree with flat leaves that are not divided and have rounded lobes on the edge. The tree is _____.
an ash tree
a beech tree
an oak tree
a pine tree
36.
A finished dichotomous key contains 14 questions, so it can identify _____.
15 different organisms
14 different organisms
7 different organisms
28 different organisms
37.
A feature such as "the flower looks pretty" is called _____ because different people may judge it differently.
an observable feature
a countable feature
a dichotomous feature
a subjective feature
38.
In a key to rock samples, "Does it scratch glass?" is better than "Is it hard?" because it _____.
uses a longer and more scientific word
turns an opinion into a clear yes/no test
can only be answered by a trained geologist
gives three possible answers instead of two
39.
The learners later catch a caddis fly larva, which has six jointed legs and lives in a case it builds. To add it to the key in the diagram they need exactly one extra question. True or false?
Dr Dabour Hub Science Diagram and Course Material
True – seven animals need 7 − 1 = 6 questions
False – every new animal needs two extra questions
False – the whole key must be started again from step 1
True, but only if the larva is placed at the first step
40.
For the six animals in the diagram, the question "Does it have more than eight legs?" gets the answer yes only for the woodlouse and the centipede. True or false?
Dr Dabour Hub Science Diagram and Course Material
True – the spider has exactly eight, so it answers no
False – the spider has more than eight legs, so it is a yes
False – the wasp has wings as well as legs, so it is a yes
True, but only if the snail is left out of the key first
41.
In a chain-shaped key for 6 organisms, where every question separates off just one organism, the last two organisms each need 5 questions to reach their names. True or false?
False – every organism needs exactly 3 questions
False – a key for 6 organisms has only 3 questions
True, but only if the organisms are all animals
True – each earlier question removes only one
42.
A balanced key and a chain-shaped key for the same 10 organisms contain different total numbers of questions. True or false?
True – the balanced key has only 4 questions
False – both contain 10 − 1 = 9 questions
True – the chain key has 10 questions
True, but only when the group has an odd number
43.
A key built from the features of adult butterflies can reliably be used to identify their caterpillars. True or false?
True – all stages of one species share every feature
False – caterpillars lack the wings and adult features used
True – caterpillars and adults have the same number of legs
True, but only when the caterpillars are fully grown
44.
A fish farm tank holds young and adult fish of two species. Because it uses a measurement, the step "Body longer than 20 cm / 20 cm or shorter" will separate the two species reliably. True or false?
True – a measured length can never give a wrong answer
True – adult fish of both species are exactly 20 cm long
False – body length also changes as each fish grows
False – fish must never be measured when using a key
45.
Jamal's key worked for all 12 plants in the school garden, so it will correctly name any new plant that appears there. True or false?
True – a tested key works for every plant in the area
True – new plants always share features with the old ones
False – keys can only ever identify animals, not plants
False – it can only name plants it was built for
46.
Ecologists give keys to volunteers so that people who are not experts identify organisms in a survey quickly and consistently. True or false?
True – clear feature questions give everyone the same answer
False – only experts are allowed to use a dichotomous key
False – keys are used only to name brand-new species
True, but only if the volunteers know the names already
47.
When Ali splits a group of 5 organisms, a first question that makes groups of 2 and 3 is as balanced as he can make it. True or false?
True – an odd number cannot be split equally
False – he must first split them into 4 and 1
False – the first question must split them 5 and 0
True, but only if all five organisms are insects
48.
In a numbered key, statements 3a and 3b should both describe the same feature, one saying it is present and one saying it is absent (or different). True or false?
False – 3a and 3b should use two different features
False – 3b should repeat the question from step 1
True – each step is one feature and its opposite
True, but only for the final step of the key
49.
In a key to invertebrates, the question "Does it have eight legs?" can separate arachnids such as spiders and mites from insects. True or false?
False – insects and arachnids both have 8 legs
False – arachnids have 6 legs and insects have 8
True, but only for arachnids that spin webs
True – arachnids have 8 legs and insects have 6
50.
"Does it have a backbone?" is a good first question for a key to an earthworm, a snail, a crab, a frog, a lizard and an owl. True or false?
False – it separates only the owl from the rest
False – all six of these animals have a backbone
True – it splits them into two groups of three
True, but only when all six are alive and moving
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Part of Grade 8 - Unit 4: Living organisms and classification — see every lesson and quiz in this unit.
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