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Unit 6 Gcse

Total questions: 160

Worksheet time: 2hrs 8mins

Name
Class
Date
1.

What is a square called that we use to sample populations?

a)

grid

b)

quadrat

c)

cube

d)

quarter

2.

What type of population would you ESTIMATE using a quadrat?

a)
b)
c)
d)
3.

Limpets were found in 25 out of 50 quadrats. What percentage of quadrats contained limpets?

a)

100%

b)

25%

c)

50%

d)

75%

4.

These four 1m2 squared quadrats were place in a 8m2 garden. Estimate the total population of flowers in the whole garden.

a)

16

b)

17

c)

8

d)

40

e)

20

5.

Which organism can be measured with a quadrat?

a)

lion

b)

flies

c)

rat

d)

dandelion plants

e)

fish

6.

This 1m2 squared quadrat was place in a 3m2 beach. Estimate the total population of crabs in the whole beach.

a)

15

b)

12

c)

18

d)

6

e)

5

7.

what is meant by structural adaptations?

a)

these are ways that organisms behave

b)

these are things that go on inside an organism's body

c)

there are no such things as structural adaptations

d)

these are features of an organism's body structure

8.

These are used to study the distribution of organisms

a)

microscopes

b)

transects

c)

measuring cylinders

d)

quadrats

9.

Why do scientists use sampling techniques to gather population data rather than counting everything?

a)

scientists are lazy

b)

sampling is more efficient and achievable

c)

sampling is more accurate

d)

scientists prefer estimations

e)

sampling is cheaper

10.

Tn 1m2 quadrats were placed in a 40m2 field. On average 2 snails were found in every quadrat. Estimate the population size of the whole field.

a)

2

b)

10

c)

40

d)

80

e)

20

11.

Food webs always start with:

a)

the sun

b)

producers

c)

primary consumers

d)

microorgansims

12.

Which of the following is random-sampling used for?

a)

Vegetation

b)

Animals

c)

People

d)

Bacteria

13.

All the organisms that live and interact in an ecosystem

a)

Population

b)

Community

c)

Habitat

d)

Interdependent

14.

Which of the following is NOT a biotic factor?

a)

mushroom

b)

air

c)

elephant

d)

coyote

15.

What does biodiversity mean?

a)

The number of organisms within a species

b)

The variety of living things within an ecosystem

c)

The number of steps within a food chain

d)

How biology is divided

16.

The technique which ecologists use to quantify the biodiversity of area is called?

a)

Sampling

b)

Documentation

c)

Recording

d)

Observation

17.

The apparatus used to quantify plants is called

a)

Camera

b)

Pitfall trap

c)

Quadrat

d)

Notepad

18.

Why is it that the higher the biodiversity the healthier the ecosystem?

a)

Healthy ecosystem has more insects that feed everything else

b)

Healthy ecosystem tends to make bigger animals

c)

High biodiversity of an ecosystem allows it to more resilient to changes

d)

High diversity means the area is looked after people

19.

Why are quadrats placed randomly?

a)

To ensure repeatability

b)

To improve accuracy

c)

To avoid bias

d)

To ensure validity of results

20.

If a field has an area of 40m240m^2 , a quadrat has an area of 1m21m^2 , and the average number of daisies in each quadrat is 2, what is the estimated number of daisies in the field?

a)

8

b)

80

c)

800

d)

8000

21.

What method would you use to monitor the change in distribution of species due to changes in environmental conditions?

a)

Random quadrats

b)

Line transect

c)

Capture-recapture

22.

There are three main sampling techniques that can be used in ecology. Which of the following is not one of them?

a)

Random

b)

Systematic

c)

Stratified

d)

Clustered

23.

Which of the following statements describes stratified sampling?

a)

Stratified sampling is used when the population has known subsets.

b)

Stratified sampling is used when every item has the same chance of being selected.

c)

Stratified sampling is where samples are chosen in a regular way.

d)

All of the statements describe an aspect of stratified sampling.

24.

Relative representation of a species in a particular ecosystem , best describes?

a)

abundance

b)

distribution

c)

individual count

d)

percentage cover

25.

Where a species of an organism is found in the environment and how it is organised , best describes?

a)

abundance

b)

distribution

c)

individual count

d)

percentage cover

26.

name this piece of equipment

a)

quadrant

b)

sqaure

c)

frame

d)

quadrat

27.

What is the name of the survey used to assess changing biotic data across ecosystem profiles?

a)

Line transect

b)

Quadrat survey

c)

Belt transect

d)

Linear sampling

28.

What type of population would you ESTIMATE using a quadrat?

a)
b)
c)
d)
29.

Limpets were found in 25 out of 50 quadrats. What percentage of quadrats contained limpets?

a)

100%

b)

25%

c)

50%

d)

75%

30.

Why do scientists use sampling techniques to gather population data rather than counting everything?

a)

scientists are lazy

b)

sampling is more efficient and achievable

c)

sampling is more accurate

d)

scientists prefer estimations

e)

sampling is cheaper

31.

What do we call a sample that is drawn from a number of separate strata of the population, rather than at random from the whole population, in order that it should be representative?

a)

Systematic Sample

b)

Stratified Sample

c)

Simple Random Sample

d)

Convenience Sample

32.

All introduced species are invasive

a)

true

b)

false

33.

Introduced species can be brought to a country unknowingly

a)

true

b)

false

34.
When taken to a new habitat, non-native plants often threaten native plants of the new habitat.  Why do they do this?
a)
Non-native plants are able to mutate rapidly
b)
Non-native  plants cause native animals to relocate
c)
Non-native plants are able to be used for medicine
d)
Non-native plants compete with native plants for resources
35.
1. What makes a species invasive?
a)
Moving to a new ecosystem and taking resources from natives 
b)
Not having papers
c)
Species that can't adapt
d)
Plants that take up too much space
36.
If a blue catfish is introduced and eats the large fish who eat the smaller fish, what will happen to the population of the smaller fish?
a)
Increase
b)
Decrease
c)
Stay the same
d)
No affect on smaller fish
37.
Which of the following is a key characteristic of most invasive species?
a)
Ability to breathe in the air & in the water
b)
Large, sharp teeth
c)
Produce many offspring
d)
Is a top predator
38.

What is a native species?

a)

A species that is local and has lived in the same place

b)

A species who has come from another state or country

c)

A species that has no "home" and travels for its whole life

d)

None of the above

39.
Invasive species have a negative impact on...
a)
the ecosystem
b)
the economy
c)
Both the ecosystem and the economy
d)
None of these
40.

A species form that supports an entire ecosystem.

a)

Keystone Species

b)

Herbivores

c)

Umbrella Species

d)

Predators

41.

Why are bees considered a keystone species?

a)

The honey they make supports the bear population

b)

They pollinate flowers that produce fruit which supports the ecosystem

c)

They sting when threatened

d)

They live in hives

42.

What is species diversity?

a)

the different animals in an area

b)

the different habitats in an area

c)

the different plants in an area

d)

the different living things (plants and animals) in an area

43.

What is an invasive species?

a)

an organism that IS native to an area and causes harm to the environment/humans

b)

an organism that is NOT native to an area and causes harm to the environment/humans

c)

an organism that is NOT native to an area and helps the environment/humans

d)

an organism that IS native to an area and helps the environment/humans

44.
A species that is not native to an area is called: 
a)
Native Species
b)
Natural Species
c)
Invasive Species
d)
Symbiotic Species
45.

Invasive species can have a major impact on the ecosystem.

a)

TRUE

b)

FALSE

46.

Why do the populations of invasive species grow so quickly?

a)

Invasive Species are native to an area.

b)

Invasive species are prey to many animals.

c)

Invasive species have no natural predators.

d)

Invasive species keep the ecosystems in equilibrium.

47.

Invasive species can crowd out native species.

a)

TRUE

b)

FALSE

48.

The primary cause of invasive species introduction is

a)

too much food

b)

human actions

c)

weather events

d)

asteroids

49.
A species indigenous to a given region or ecosystem naturally.
a)
Native Species
b)
Accidental Species
c)
Introduced Species
50.
This invasive species came over in boats from Europe in the 1980's.  They harm native fish, clog pipes and ruin beaches.  
a)
Sea Lamprey
b)
Zebra Mussel
c)
Asian Carp
d)
Feral Swine
51.
A sea otter and a sea star are examples of...
a)
invasive species
b)
keystone species
c)
native species 
d)
symbiotic species
52.

the variety of life in the world or in a particular habitat or ecosystem

a)

biodiversity

b)

demography

c)

carrying capacity

d)

poaching

53.

a species that is not native to a particular region

a)

endemic

b)

exotic

c)

endangered

d)

extinct

54.

species that are native to and found only within a limited area

a)

endemic

b)

exotic

c)

endangered

d)

extinct

55.

a species at risk, but not yet endangered

a)

endangered

b)

exotic

c)

endemic

d)

threatened

56.

How many species are estimated to be living on Earth?

a)

between 10,000 and 100,000

b)

between 1 and 2 million

c)

between 500,000 and 1 million

d)

between 10 and 50 million

57.

Which of the following would be most effective in slowing the loss of biodiversity?

a)

creating large parks/preserves in biodiversity hotspots

b)

requiring every country to maintain a seed bank

58.

In what part of the world are the greatest number of extinctions occurring?

a)

in deserts

b)

in the Arctic

c)

in tropical rain forests

59.

The level of biodiversity that involves a variety of habits and communities is _____ diversity.

a)

ecosystem

b)

population

c)

genetic

d)

species

60.

What level of biodiversity is most commonly equated with the overall concept of biodiversity?

a)

genetic

b)

ecosystem

c)

species

61.

Why is biodiversity important to ecosystems?

a)

It helps populations adapt to ecological changes.

b)

It increases at each level of the food chain.

62.
Currently sharks are on a rapid decline due to overfishing. If sharks go extinct will this affect the biodiversity of the ocean?
a)
No, sharks are not important.
b)
No, sharks will only affect the seal populations.
c)
Yes, it will disrupt the entire food chain in the ocean.
d)
Yes, but only a little.
63.

The LESS genetically diverse a population is, the better it can respond to environmental stressors

a)

True

b)

False

64.

The ecological diversity involves all of the following except

a)

Number of niches

b)

Trophic levels

c)

Genetic factors

d)

Ecological Processes

65.
What is an invasive species?
a)
A native (naturally found) species which are added to an area. 
b)
A non-native (not naturally found) species added to an area. 
c)
A keystone species in an environment
d)
none of the above
66.
What is the variety of genes present?
a)
bidiversity
b)
species diversity
c)
extinction
d)
genetic diversity
67.
The number of different species and the abundance of each species in a biological community.
a)
genetic diversity
b)
ecosystem diversity
c)
extinction
d)
species diversity
68.

This is the extinction of a species one by one, not a sudden loss of many species

a)

background extinction

b)

mass extinction

c)

fragmentation

d)

biotic potential

69.

This classification of risk means that the species is at serious risk of extinction.

a)

threatened

b)

vulnerable

c)

endangered

d)

extinct

70.

The status of a "threatened species" means:

a)

they are almost extinct

b)

they are likely to become endangered

c)

they are extinct

d)

their numbers are increasing

71.

All of the following are causes for biodiversity loss, EXCEPT:

a)

Habitat Loss

b)

Invasive Species

c)

Replanting trees

d)

Pollution

72.

Forest clearing, farming, and road building are all examples of

a)

Biodiversity

b)

Population distribution

c)

Habitat loss

d)

Climate Change

73.

The greatest cause of biodiversity loss today is

a)

Pollution

b)

Habitat loss and change

c)

Climate Change

d)

Invasive species

74.

All of the following affect biodiversity only in certain locations and times, EXCEPT:

a)

Pollution

b)

Invasive Species

c)

Climate Change

d)

Overharvesting

75.

Paths created for wildlife to safely travel between areas of an ecosystem are called

a)

biodiversity paths

b)

habitat corridors

c)

wildlife corridors

d)

ecosystem paths

76.

In 1973 the __________ ___________ _________ was passed to help pass laws protecting biodiversity.

a)

Wildlife Species Act

b)

Extinction Protection Act

c)

Endangered Reduction Act

d)

Endangered Species Act

77.

Where does most air pollution come from?

a)

Human activities

b)

Wildfires

c)

Volcanic eruptions

d)

Allergens

78.

The area where a plant or animal lives

a)

environment

b)

location

c)

habitat

d)

home

79.

What is a human activity that can cause habitat destruction?

a)

Planting trees

b)

Buying clothes

c)

Deforestation

d)

Pick up fruits and vegetables

80.

In the past hundred years, biodiversity around the world has ____________ dramatically?

a)

Increased

b)

Decreased

81.
What nation enacted the ESA (Endangered Species Act) in 1973?
a)
Canada
b)
U.S
c)
Spain
d)
England
82.
What is the goal of the ESA?
a)
Prevent extinctions by protecting at-risk species
b)
Prevent widespread populations of at-risk species
83.
Which one is not a center for captive breeding programs?
a)
Zoo
b)
Botanical Gardens
c)
Aquarium
d)
Forests
84.
What is another single-species approach?
a)
Reducing
b)
Cloning
c)
Dominating
d)
Enhancing
85.
What are endemic species?
a)
species is found everywhere else in the world
b)
species is found nowhere else in the world
86.
What are biodiversity hotspots?
a)
Area that both supports a high # of endemic species and is rapidly losing biodiversity
b)
Area that both supports a low # of endemic species and is rapidly gaining biodiversity
87.

Which one is NOT a benefits of wildlife corridors:

a)

Connects habitats fragments together

b)

It keeps species apart so they don't fight each other

c)

Allows populations to interbreed

d)

Increases genetic diversity

88.
How does the biodiversity hotspot approach differ from the single species approach?
a)
Focuses on oceans, rather than land species
b)
Focuses on geographic regions, rather than single species
89.

Identify the purpose of IUCN Red List.

a)

indicates the pollution rate

b)

has the name of all species recorded

c)

indicates health of world's biodiversity

90.

Which one these is NOT a result of loss of biodiversity?

a)

decline in plant production

b)

co-extinction

c)

variability in processes of ecosystem

d)

lowered resistance to natural perturbations

91.

The recent illegal introduction of the African catfish for aquaculture purposes is posing a threat to the indigenous catfishes in our rivers.

It's an example of ___

a)

coextinction

b)

habitat loss

c)

over exploitation

d)

alien species invasions

92.

a coevolved plant-pollinator mutualism where extinction of one invariably leads to the extinction of the other.

It is an example of ____

a)

habitat loss

b)

fragmentation

c)

coextinction

d)

over exploitation

93.

How much of acres of Amazon rainforest is being cleared almost everyday?

a)

10,000

b)

20,000

c)

1000

d)

100,000

94.

What the people from the farm do when they collect the products

a)

Convenient

b)

Impact

c)

Wholesome

d)

Harvest

95.

A combination of related parts offered as a unit

a)

wholesome

b)

package

c)

entrée

d)

commercial

96.

influence or effect on something or someone

a)

harvest

b)

local

c)

impact

d)

taste

97.

useful in a purpose

a)

entrée

b)

wholesome

c)

convenient

d)

commercial

98.

Synonym of preference

a)

impact

b)

taste

c)

entrée

d)

local

99.

the main dish of a meal

a)

wholesome

b)

impact

c)

harvest

d)

entrée

100.

beneficial, good for your health

a)

entrée

b)

package

c)

wholesome

d)

commercial

101.

related to a particular place or area

a)

commercial

b)

local

c)

impact

d)

diverse

102.

of various forms or kinds

a)

commercial

b)

harvest

c)

diverse

d)

wholesome

103.

made, produced, or marketed to make money

a)

local

b)

diverse

c)

entrée

d)

commercial

104.

Plant-based meat burgers are cheaper than normal meat burgers.

True or False?

a)

True

b)

False

105.

Frozen meat is leftover chilled meat that has been frozen

or comes from inferior quality sources.

True or False?

a)

True

b)

False

106.

Egg powder and liquid eggs provide as much nutritional value as fresh eggs.

True or False?

a)

True

b)

False

107.

 10% of our land is allocated to agricultural production.

True or False?

a)

True

b)

False

108.

What % of our food comes from local sources?

a)

5%

b)

10%

c)

20%

d)

40%

109.

In 2021, which of these countries provided the highest

supply of chickens to Singapore?

a)

Malaysia

b)

United States

c)

Brazil

d)

Indonesia

110.

Where does Singapore import hen shell eggs from?

a)

Germany

b)

China

c)

Ukraine

111.

Singapore stockpiles food and essentials.

The Rice Stockpile scheme was started in the year ____.

a)

1966

b)

1967

c)

1968

d)

1969

112.

What role can each of us play in the Singapore Food Story?

4 lines
113.

What are some other ways that we can contribute to strengthening Singapore’s food security, as individuals and as a community?

4 lines
114.

I used to think Food Security means...

Now I think Food Security means...

4 lines
115.
This diagram shows a
a)
sensory neurone
b)
motor neurone
c)
relay neurone
d)
association neurone
116.

Food security is best describe as?

a)

More than 50% of the population having access to food

b)

100% of the population having access to food 50% of the time

c)

All people at all times having access to food

d)

food that is stored securely

117.

According to the map the continent with the least food security is?

a)

Africa

b)

North America

c)

Australia

d)

Asia

118.

Which type of farming is shown in the picture?

a)

Extensive

b)

Intensive

c)

Intrinsic

d)

Extrinsic

119.

Which type of farming is shown in this picture?

a)

Extensive

b)

Intensive

c)

Intrinsic

d)

Extrinsic

120.
Climate change affects agriculture through changes in _________.
a)
temperature
b)
rainfall
c)
carbon dioxide
d)
all of these
121.

Which of the following is a way of overcoming limitations in climate?

a)

Greenhouses

b)

Pest nets

c)

Pesticides

122.
Extreme weather events include _________.
a)
flooding 
b)
droughts
c)
heat waves
d)
all of these
123.
maintain stable internal conditions. Examples include fever and vomiting.
a)
homeostasis
b)
telekinesis
c)
alveoli
d)
epidermis
124.
a body system that controls and coordinates all body activities through electric impulses/messages between brain, spinal cord and nerves.
a)
endocrine system 
b)
nervous system
c)
nerve
d)
neuron
125.
main organ of the nervous system. protected by the skull, and made of neurons, it is the control center for all actions, thoughts and emotions.
a)
brain
b)
electrical impulse
c)
gland
d)
heart
126.
organ of the endocrine system that secretes hormones.
a)
heart
b)
gland
c)
brain
d)
skin
127.
effect of a stimulus. (happens 2nd) Involuntary/automatic reaction.
a)
stimulus
b)
response
128.
response of the nervous system to get rid of germs in the stomach. An example of homeostasis.
a)
fever
b)
vomiting
c)
perspiration
d)
death
129.
involuntary response by the nervous system to speed up delivery of oxygen to muscles
a)
increased breathing and heart rate (faster)
b)
decreased breathing and heart rate (slower) 
130.

Which three crops account for most food production in the world?

a)

Wheat, corn and rice

b)

Potato, palm sugar and rice

c)

Wheat, potato and barley

d)

Corn, apples and carrots

131.

Competition for farmland is the result of

a)

Urbanisation

b)

Animal Pastures

c)

Armed Conflict

d)

Climate Change

132.

#3 Refers to

a)

Cornea

b)

Pupil

c)

Retina

d)

Iris

133.

#7 Refers to

a)

lens

b)

optic nerve

c)

retina

d)

sclera

134.

# 5 refers to

a)

Retina

b)

Lens

c)

Optic Nerve

d)

Lens

135.

Which part is #3?

a)

sclera

b)

cornea

c)

retina

d)

lens

136.
The Medulla Obolongata controls our ___.
a)
Blood Pressure 
b)
Muscle Memory 
c)
Pain reaction
d)
Memory 
137.
What is the largest part of the brain?
a)
Thalamus
b)
Cerebellum
c)
Spinal Cord
d)
Cerebrum
138.
a)
Cerebrum
b)
Cerebellum
c)
Brain Stem
d)
Diencephalon
139.
An organism that needs to eat other organisms to obtain energy is known as a:
a)
Autotroph
b)
Producer
c)
Consumer
d)
Mutualist
140.
What does every food chain start with? (Even if it's not drawn or written there!)
a)
producers
b)
sun
c)
consumer
d)
decomposers
141.
What does a food web represent?
a)
All connections of energy flow throughout all organisms in a habitat.
b)
The specific ways that mutualism is carried out.
c)
A single pathway or energy flow between organisms. 
d)
How carnivores get their food. 
142.
The rabbit in this food web would be considered a:
a)
Decomposer
b)
Producer
c)
Secondary Consumer
d)
Primary Consumer
143.
In this Food Web Pyramid Which type of consumer gets only 10% of the energy stored in plants?
a)
Herbivore
b)
Carnivore
c)
Omnivore
d)
Secondary Consumer
144.
The amount of energy that usually transfers from one trophic level to the next...
a)
10%
b)
20%
c)
80%
d)
50%
145.
The nonliving aspects of an ecosystem.
a)
Abiotic factors
b)
Biotic factors
146.
A collection of organisms that make up a community as well as all of the nonliving aspects of the environment.
a)
Population
b)
Community
c)
Habitat
d)
Ecosystem
147.
As you move upward, from level to level, in an energy pyramid, energy _____.
a)
increases
b)
decreases
c)
stays the same
d)
increases exponentially
148.
What are the Abiotic factors in this image? 
a)
water, sunlight, dirt, air
b)
birds and plants
c)
birds, water, dirt
d)
plants, water
149.
The diagram below shows the cycling of nutrients in an ecosystem.
The removal of which of the following groups would cause an immediate decrease in the amount of energy flowing through the system?
a)
Producers
b)
Consumers
c)
Decomposers
d)
Inorganic nutrients
150.
diagram that shows the energy available to each trophic level in an ecosystem; 10% is passed on to upper levels, the rest is lost as heat
a)
succession 
b)
cellular respiration
c)
energy pyramid
d)
biochemical cycle
151.
A pond ecosystem is shown in the diagram below. Which statement describes an interaction that helps maintain the dynamic equilibrium of this ecosystem?
Which statement describes an interaction that helps maintain the dynamic equilibrium of this ecosystem?
a)
The frogs make energy available to this ecosystem through the process of photosynthesis.
b)
The algae directly provide food for both the rotifers and the catfish.
c)
The green-backed heron provides energy for the mosquito larvae.
d)
The catfish population helps control the populations of water boatman and waterfleas.
152.

What type of nervous message is carried along neurons?

a)

Chemical

b)

Electrical

153.

What is the gap between two neurons called?

a)

Impulse

b)

Synapse

c)

CNS

d)

Inter neuron

154.

Name an effector in this diagram.

a)

A

b)

B

c)

D

d)

E

e)

F

155.

Where are receptors found?

a)

Start of a motor neuron

b)

Start of an inter neuron

c)

Start of a sensory neuron

d)

In a synapse

156.

What sort of message diffuses across the synapse?

a)

Electrical

b)

Chemical

c)

Physical

d)

Mental

157.

In a reflex action, the __________ bypasses the ___________

a)

Motor neuron, brain

b)

Sensory neuron, brain

c)

Sensory neuron, spinal cord

d)

Motor neuron, spinal cord

158.

In a reflex arc, the sensory neuron leads to the ___________ and the motor neuron leads to the __________

a)

Spinal cord, CNS

b)

CNS, muscle

c)

Spinal cord, muscle

d)

Muscle, CNS

159.

What is the medical term for Short-Sightedness?

a)

Hyperopia

b)

Myopia

160.
What are quorn nuggets made from?
a)
Mycoprotein
b)
Saturated fat
c)
Meatless fat
d)
Mycoportrait

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