Why does the oxygen level in freshwater decrease when it is polluted?

bacteria live on pollution and use up the oxygen

The role that an organism plays within a community

What might under-grazing lead to?

a small number of vigorous plants species take over

Why is it important that some ecosystems have animals that graze?

To allow the less dominant plant species to grow

Why might polar bears become extinct?

global warming is melting ice and they are losing habitats, All of the above

A region that has a distinctive climate, flora and fauna

the range of species which exist in an ecosystem

all the living things in an ecosystem

Which of the following is TRUE about food webs in an ecosystem?

large food webs means more biodiversity and more stable

what is an adaptation?

A feature of an organism allowing it to live in its habitat

When the canadian lynx population decreases, what happens to the hare population

It will increase and then the lynx population increases

How do harmful human activities affect biodiversity?

Loss of species and less stable

What niche would an owl occupy?

A nocturnal predator which feeds on small mammals

What does the term habitat mean?

The place where an organism lives

Which of the following are NOT characteristics of stable ecosystems?

Is highly affected by removal of one species

What is the relationship between temperature and rainfall at the tropical rainforest?

High rainfall and warm temperature

What is a population?

The total number of one type of organism in an ecosystem

Why might it be a bad thing to have a lot of grazers in an ecosystem?

Too many grazers will cause damage to plants

What is an ecosystem?

interaction between living and non-living things in an area

What happens when acid rain damages the leaves of plants?

They cannot photosynthesise well and die

Which of the following is a problem with introducing alien species?

they may outcompete native species

What do you think Islandisation means?

Isolating species so that they cannot breed together

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Duplicate of Biodiversity and the distribution of life

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Questions 30

Answers

1
Why is maintaining biodiversity important for humans?
To maintain genetic diversity
All of the above
For a greater variety of food
For a greater variety of medicines
2
Which of the following in an example of a biotic factor?
soil moisture
competition
temperature
wind speed
3
Why does the oxygen level in freshwater decrease when it is polluted?
The pollution traps oxygen bubbles in it
Bacteria are producing a lot of oxygen
bacteria live on pollution and use up the oxygen
4
What is a niche?
The amount of land an organism requires
The lifespan of an organism
The amount of food an organism eats
The role that an organism plays within a community
5
What might under-grazing lead to?
the ground becomes too wet
increased biodiversity
A large number of plant species will take over
a small number of vigorous plants species take over
6
Why is it important that some ecosystems have animals that graze?
to keep the grass short
to allow the more dominant plant species to grow
To allow the less dominant plant species to grow
to reduce the number of animals relying on meat
7
Which of the following is not an abiotic factor?
pH
light intensity
temperature
predation
8
Why might polar bears become extinct?
global warming is melting ice and they are losing habitats
They are not able to adapt to new environments fast enough
Global warming and greenhouse gas emissions continue to rise
All of the above
9
What is a biome?
An ecosystem with specific fauna
A place where all marine or all land animals live
A region that has a distinctive climate, flora and fauna
The flora that are found in an area
10
Which of the following is not an example of exploitation?
over fishing
deforrestation
releasing C02
hunting
11
Which of the following are not near extinxtion
blue whale
black rhinoceros
giant panda
American flamingo
12
what is biodiversity
the number of different types of organisms within a species
the range of species which exist in an ecosystem
The number of animals in a habitat
the number of plants in a habitat
13
What is a community?
the number of plants in an ecosystem
all the living things in an ecosystem
the number of animals in an ecosystem
All the living and non-living things in an ecosystem
14
Which of the following is TRUE about food webs in an ecosystem?
Large food webs means high biodiversity and less stable
large food webs means more biodiversity and more stable
small food webs means more biodiversity and less stable
small food webs means less biodiversity and more stable.
15
what is an adaptation?
A feature that an organism can choose to use when it wishes
A characteristic that an organism can change very quickly
A feature of an organism that makes it harder for to survive
A feature of an organism allowing it to live in its habitat
16
When the canadian lynx population decreases, what happens to the hare population
It will increase and then the lynx population increases
it will increase and the then the lynx population decreases
It will decrease and then the lynx population will increase
it will decrease and then the lynx population will decrease.
17
How do harmful human activities affect biodiversity?
Loss of species and less stable
More species and more stable
More species and less stable
Loss of species and more stable
18
What niche would an owl occupy?
A nocturnal predator which feeds on small mammals
A marine prey which feeds on zooplankton
A decomposer which lives under a rock
A small mammal which lives underground and eats insects
19
why is it impossible to know how many species there are on earth?
species become extinct before they are discovered
some species are smaller than 1mm and hard to identify
we have not explored every part of the biosphere
all of the above
20
What does the term habitat mean?
All living animals in an ecosystem
The number of non-living factors in an area
The total number of one type of species
The place where an organism lives
21
Which of the following are NOT characteristics of stable ecosystems?
Is not affected by removal of one species
contains a wide variety of species
Is highly affected by removal of one species
Can exist for a very long time
22
What is the relationship between temperature and rainfall at the tropical rainforest?
high rainfall and low temperature
low rainfall and high temperature
Low rainfall and low temperature
High rainfall and warm temperature
23
What is a population?
The total number of one type of organism in an ecosystem
The total number of different species in a habitat
The total number of animals living in one area
The number of living and non-living factors in an ecosystem
24
What has happened to the human population over time?
It has decreased
It has fluctuated
It has increased exponentially
I has increased slowly
25
Why might it be a bad thing to have a lot of grazers in an ecosystem?
Too many grazers will cause damage to plants
The grazers will become too big to be eaten by the consumers
they may have to compete with one another
they may run out of food
26
What is the name of the study of living organisms in their environment?
Geology
Botany
Biology
Ecology
27
What is an ecosystem?
the non-living things in an area
The population of each community
interaction between living and non-living things in an area
The habitat and population of one species
28
What happens when acid rain damages the leaves of plants?
They adapt to live in acidic conditions
They poison the animals that eat them
They cannot photosynthesise well and die
Nothing happens
29
Which of the following is a problem with introducing alien species?
they may be eaten by native species
they may outcompete native species
They may increase biodiversity in the ecosystem
They may improve the habitat in terms of resources
30
What do you think Islandisation means?
Putting species onto an island to encourage breeding
Isolating species so that they cannot breed together
putting an island next to an ecosystem
Putting an island into an existing ecosystem

Duplicate of Biodiversity and the distribution of life Flashcards | StudBud