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HIA International — Grade 7

Unit 1: Breathing and respiration

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Unit 2: Dissolving, solubility and chromatography

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Unit 3: Forces, motion and pressure

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Unit 4: Ecosystems

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Unit 5: Atoms, purity and climate

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Unit 6: Light and objects in space

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Unit 7: Nutrition, health and movement

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Unit 8: Energy changes and reactions of metals

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Unit 9: Magnetism and electromagnets

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Quiz

GRADE 7 – Unit 4: Ecosystems – Unit review (50 questions)

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Ecosystems HIA Science unit review quiz: free practice for HIA International. Work through this Ecosystems HIA Science unit review quiz and get instant feedback on every answer. If you get stuck, review the 13.4 Bioaccumulation – Notes lesson. More practice: HIA International — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
A coral reef and a rainforest are both examples of:
Food chains only
Organs
Populations of one species
Ecosystems
2.
The diagram describes four levels of organisation in a pond, labelled P, Q, R and S. Which letter shows a community?
Dr Dabour Hub Academy - figure 1
Letter P
Letter Q
Letter R
Letter S
3.
Mia sampled the water in a pond once a month for eight months. She measured the water temperature and the dissolved oxygen each time. Which conclusion does the graph support?
Dr Dabour Hub Academy - figure 2
Warmer pond water holds less dissolved oxygen
Warmer pond water holds more dissolved oxygen
There is no pattern between the two abiotic factors
Dissolved oxygen stays the same all through the year
4.
An invasive species can harm an ecosystem because it:
Only eats plants
Competes with native species and may have no predators
Always becomes extinct
Improves biodiversity always
5.
Omar placed a quadrat every 4 m along a line from a sunny field into a wood. At each quadrat he estimated the grass cover and measured the light. Which conclusion fits his results?
Dr Dabour Hub Academy - figure 3
Grass cover rises the further he goes into the wood
The grass is causing the shade inside the wood
Light has no link with how much grass grows there
Grass cover falls as the light gets dimmer
6.
Volunteers counted squirrels in a British wood every five years. Grey squirrels were first seen there in 1990. Which explanation best fits the graph?
Dr Dabour Hub Academy - figure 4
Reds had died out first, so greys moved into an empty wood
Greys out-compete reds and spread a virus to them
Reds are predators of greys, so both populations fell
The total number of squirrels stayed exactly the same
7.
Which term is described as: a substance that kills insects, such as DDT?
insecticide
persistent
DDT
decomposer
8.
Match the term to its correct meaning: insecticide
a substance that kills insects, such as DDT
poisonous
to build up, as DDT does in an animal's body over its life
an insecticide first produced in the 1940s that does not break down
9.
Which term is described as: an insecticide first produced in the 1940s that does not break down?
DDT
bioaccumulation
biomagnification
decomposer
10.
Match the term to its correct meaning: DDT
to build up, as DDT does in an animal's body over its life
an insecticide first produced in the 1940s that does not break down
describing a chemical that does not break down and stays in the environment for years
the increase in the amount of a substance at each step up a food chain
11.
Which term is described as: describing a chemical that does not break down and stays in the environment for years?
persistent
insecticide
toxic
DDT
12.
Match the term to its correct meaning: persistent
to build up, as DDT does in an animal's body over its life
describing a chemical that does not break down and stays in the environment for years
the increase in the amount of a substance at each step up a food chain
the build-up of a substance inside the body of an organism
13.
Which term is described as: all the living things in a place together with the non-living parts they interact with?
ecosystem
teddy bear cholla
interact
germinate
14.
Which term is described as: to dig into the soil where it is cooler, as desert animals do during hot days?
predator
burrow
teddy bear cholla
saguaro cactus
15.
Which term is described as: the particular place within an ecosystem where an organism lives?
habitat
ice floe
decomposed
fertiliser
16.
Which term is described as: a species that developed in a place and belongs there?
native species
extinct
introduced species
control
17.
Match the term to its correct meaning: introduced species
the fierce hunter brought from Europe to control rabbits in New Zealand
a species brought into a place where it does not belong
no longer existing anywhere - as the laughing owl became
a native New Zealand bird that cannot fly
18.
Which term is described as: poisonous?
insecticide
biomagnification
toxic
accumulate
19.
Which term is described as: to build up, as DDT does in an animal's body over its life?
insecticide
accumulate
toxic
DDT
20.
Which term is described as: the tall desert plant whose roots spread widely just under the soil to absorb any rain?
ecosystem
teddy bear cholla
saguaro cactus
predator
21.
Match the term to its correct meaning: biomagnification
to build up, as DDT does in an animal's body over its life
an insecticide first produced in the 1940s that does not break down
the increase in the amount of a substance at each step up a food chain
a substance that kills insects, such as DDT
22.
Match the term to its correct meaning: predator
all the living things in a place together with the non-living parts they interact with
the sweet liquid in flowers that bats feed on at night
to affect one another - the actions of one organism affect another
an animal that hunts and eats other animals, such as a rattlesnake or a coyote
23.
Match the term to its correct meaning: habitat
the particular place within an ecosystem where an organism lives
tiny single-celled plants, which grow under Arctic ice and in flooded paddy fields
a tree that can grow with its roots in sea water, forming forests along tropical coasts
the channel fish swim into the flooded paddy fields from
24.
Match the term to its correct meaning: native species
a species that developed in a place and belongs there
to get rid of a species completely
the fierce hunter brought from Europe to control rabbits in New Zealand
a species brought into a place where it does not belong
25.
Match the term to its correct meaning: toxic
the increase in the amount of a substance at each step up a food chain
an organism that breaks substances down - but it cannot break down DDT
a substance that kills insects, such as DDT
poisonous
26.
Match the term to its correct meaning: ecosystem
all the living things in a place together with the non-living parts they interact with
an animal that hunts and eats other animals, such as a rattlesnake or a coyote
a feature that helps an organism survive where it lives, such as surviving with little water
the sweet liquid in flowers that bats feed on at night
27.
Which term is described as: a tree that can grow with its roots in sea water, forming forests along tropical coasts?
mangrove
algae
rice paddy
fertiliser
28.
Which term is described as: a species brought into a place where it does not belong?
introduced species
predatory mammal
kiwi
control
29.
Which term is described as: the build-up of a substance inside the body of an organism?
biomagnification
insecticide
bioaccumulation
toxic
30.
Which term is described as: a feature that helps an organism survive where it lives, such as surviving with little water?
adaptation
predator
burrow
germinate
31.
Match the term to its correct meaning: germinate
a feature that helps an organism survive where it lives, such as surviving with little water
the very spiky cactus the cactus wren nests in, so few other animals come close
an animal that hunts and eats other animals, such as a rattlesnake or a coyote
what an uneaten seed does months or years later to produce a new plant
32.
A substance that kills insects is called an _____.
antibiotic
adaptation
fertiliser
insecticide
33.
A chemical that does not break down and stays for years is described as _____.
soluble
natural
persistent
toxic
34.
Toxic means _____.
heavy
expensive
invisible
poisonous
35.
The particular place within an ecosystem where an organism lives is its _____.
adaptation
population
ecosystem
habitat
36.
A species that belongs in a place and developed there is a _____ species.
extinct
invasive
introduced
native
37.
A feature that helps an organism survive where it lives is called an _____.
interaction
extinction
ecosystem
adaptation
38.
The build-up of a substance inside an organism's body is called _____.
diffusion
biomagnification
bioaccumulation
decomposition
39.
DDT is an insecticide, which means it kills insects. - True or false?
True
False
40.
DDT is a fertiliser, which means it helps plants grow. - True or false?
True
False
41.
DDT was first produced in the 1940s. - True or false?
True
False
42.
An ecosystem is more than just a place - it includes the organisms and their interactions. - True or false?
True
False
43.
Deserts do not get much rainfall. - True or false?
True
False
44.
New Zealand became separated from other land about 66 million years ago. - True or false?
True
False
45.
DDT was first produced in the 1990s. - True or false?
True
False
46.
Rats eat only plants and never harm birds. - True or false?
True
False
47.
The roots of a saguaro cactus spread out widely just under the soil. - True or false?
True
False
48.
DDT was used to kill mosquitoes that transmit malaria. - True or false?
True
False
49.
An ecosystem is simply a place, and nothing more. - True or false?
True
False
50.
New Zealand became separated from other land about 700 years ago. - True or false?
True
False
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Part of Unit 4: Ecosystems — see every lesson and quiz in this unit.
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