Communities and Ecosystems

Question 1 of 20

1

What is the definition of species?

Select one or more of the following:

a community and its abiotic environment
a group of organisms that can interbreed and produce fertile, viable offsrping
a group of organisms of the same species in the same area at the same time
organisms that live in or on non-living matter, secreting digestive enzymes into it and absorbing the produce from digestion

Explanation

Question 2 of 20

1

What is a population?

Select one or more of the following:

a group of organisms of the same species in the same area at the same time
the environment a species normally lives or the location of a living organism
the study of relationships between living organisms and organisms and their environment
a community and its abiotic environment

Explanation

Question 3 of 20

1

What is ecology?

Select one or more of the following:

a group of organisms of the same species in the same area at the same time
the environment a species normally lives or the location of a living organism
the study of relationships between living organisms and organisms and their environment
a community and its abiotic environment

Explanation

Question 4 of 20

1

What is a habitat?

Select one or more of the following:

a group of organisms of the same species in the same area at the same time
the environment a species normally lives or the location of a living organism
the study of relationships between living organisms and organisms and their environment
a community and its abiotic environment

Explanation

Question 5 of 20

1

What is an ecosystem?

Select one or more of the following:

a group of organisms of the same species in the same area at the same time
the environment a species normally lives or the location of a living organism
the study of relationships between living organisms and organisms and their environment
a community and its abiotic environment

Explanation

Question 6 of 20

1

What is an autotroph?

Select one or more of the following:

an organism that obtains organic molecules from other organisms
an organism that digests non-living matter
an organism that synthesises organic molecules as its food source
an organism that obtains food by feeding on living/recently killed matter

Explanation

Question 7 of 20

1

What is a heterotroph?

Select one or more of the following:

an organism that obtains food by feeding on living/recently killed matter
an organism that obtains organic molecules from other organisms
an organism that synthesises organic molecules as its food source
an organism that ingests non-living matter

Explanation

Question 8 of 20

1

What is a detritivore?

Select one or more of the following:

an organism that ingests non-living matter
an organism that obtains food by feeding on other organisms
an organism that lives on/in non-living matter, secreting digestive enzymes into it and absorbing the produce from digestion
an organism that synthesises organic molecules for it food source

Explanation

Question 9 of 20

1

What is a saprotroph?

Select one or more of the following:

an organism that lives on/in non-living matter, secreting digestive enzymes into it and absorbing the produce from digestion
an organism that ingests non-living matter
an organism that obtains organic molecules from other organism
an organism that obtains food by feeding on living/recently killed matter

Explanation

Question 10 of 20

1

What is a saprotroph?

Select one or more of the following:

an organism that lives on/in non-living matter, secreting digestive enzymes into it and absorbing the produce from digestion
an organism that ingests non-living matter
an organism that obtains organic molecules from other organism
an organism that obtains food by feeding on living/recently killed matter

Explanation

Question 11 of 20

1

What is a consumer?

Select one or more of the following:

an organism that obtains food by feeding on living/recently killed matter
a group of populations living and interacting with each other in an area
an organism that ingests non-living matter
a group of organisms of the same species in the same area at the same time

Explanation

Question 12 of 20

1

What is a community?

Select one or more of the following:

a group of populations living and interacting with each other in an area
a group of organisms of the same species in the same place at the same time
the environment a species normally lives or the location of a living organism
a community and it abiotic environment

Explanation

Question 13 of 20

1

Describe what is meant by a food chain. Tick three answers

Select one or more of the following:

A food chain shows the linear feeding relationships between species in a community
A food chain shows the interaction between species in a habitat
The arrows represent the transfer of energy and matter as one organism is eaten by another
The first organism in the sequence is the consumer, followed by producers
The first organism in the sequence is the producer, followed by consumers

Explanation

Question 14 of 20

1

Describe what is meant by a food chain. Tick two answers

Select one or more of the following:

A food web is a diagram that shows how food chains are linked together into more complex feeding relationships within a community
There can only be one producer in a food web. The consumers can occupy multiple positions in the trophic levels
There can be more than one producer in a food web, and consumers can occupy multiple positions in the trophic levels

Explanation

Question 15 of 20

1

A trophic level refers to an organism's position in a food chain

Select one of the following:

True
False

Explanation

Question 16 of 20

1

Deduce the trophic level(s) of the waterweed, frog and kingfisher

Select one or more of the following:

waterweed = 1
frog = 3
kingfisher =4
waterweed = 1
frog = 3,4
kingfisher =4
waterweed = 1
frog = 3,4
kingfisher =3,4,5
waterweed = 1
frog = 3,4
kingfisher =3,4

Explanation

Question 17 of 20

1

Explain the energy flow in a food chain. Tick 4.

Select one or more of the following:

Energy enters most communities as light, where it is absorbed by autotrophs (e.g. plants) and converted into chemical energy via photosynthesis
Energy enters most communities as light, where it is absorbed by heterotrophs (e.g. animals) and converted into chemical energy via photosynthesis
Only ~10% of energy is passed from one trophic level to the next, the rest is lost
Energy then gets passed to the primary consumer (herbivore) when they eat the plant, and then gets passed to successive consumers (carnivores) as they are eaten in turn
Because ~90% of energy is lost between trophic levels, the number of trophic levels are limited as energy flow is reduced at higher levels

Explanation

Question 18 of 20

1

why is light the initial energy source for almost all communities?

Select one or more of the following:

All green plants, and some bacteria, use light as a source of energy for synthesising organic molecules
All green plants, animals, and some bacteria, use light as a source of energy for synthesising organic molecules
All green plants, and bacteria, use light as a source of energy for synthesising organic molecules

Explanation

Question 19 of 20

1

Why is the energy transformation presented as a pyramid?

Select one or more of the following:

The energy transfer is never 100% efficient
Each level of the pyramid of energy should be approximately one tenth the size of the level preceding it, as energy transformations are ~10% efficient
Typically, energy transformations in living things are ~90% efficient, with about 10% of the energy lost between trophic levels
Pyramids of energy will never appear inverted as some of the energy stored in one source is always lost when transferred to the next source
This energy may be lost as heat, be used up during cellular respiration, be excreted in faeces or remain unconsumed as the uneaten part of food

Explanation

Question 20 of 20

1

The saprotrophic activity of decomposers (certain bacteria and fungi), free inorganic materials from the dead bodies and waste products of organisms, ensuring a continual supply of raw materials for the producers (which can then be ingested by consumers)

Select one of the following:

True
False

	Created by hanalou about 10 years ago

IB Biology (Ecology and Environment) Quiz on Communities and Ecosystems, created by hanalou on 20/02/2014.

Communities and Ecosystems

Question 1 of 20

What is the definition of species?

Select one or more of the following:

Explanation

Question 2 of 20

What is a population?

Select one or more of the following:

Explanation

Question 3 of 20

What is ecology?

Select one or more of the following:

Explanation

Question 4 of 20

What is a habitat?

Select one or more of the following:

Explanation

Question 5 of 20

What is an ecosystem?

Select one or more of the following:

Explanation

Question 6 of 20

What is an autotroph?

Select one or more of the following:

Explanation

Question 7 of 20

What is a heterotroph?

Select one or more of the following:

Explanation

Question 8 of 20

What is a detritivore?

Select one or more of the following:

Explanation

Question 9 of 20

What is a saprotroph?

Select one or more of the following:

Explanation

Question 10 of 20

What is a saprotroph?

Select one or more of the following:

Explanation

Question 11 of 20

What is a consumer?

Select one or more of the following:

Explanation

Question 12 of 20

What is a community?

Select one or more of the following:

Explanation

Question 13 of 20

Describe what is meant by a food chain. Tick three answers

Select one or more of the following:

Explanation

Question 14 of 20

Describe what is meant by a food chain. Tick two answers

Select one or more of the following:

Explanation

Question 15 of 20

A trophic level refers to an organism's position in a food chain

Select one of the following:

Explanation

Question 16 of 20

Deduce the trophic level(s) of the waterweed, frog and kingfisher

Select one or more of the following:

Explanation

Question 17 of 20

Explain the energy flow in a food chain. Tick 4.

Select one or more of the following:

Explanation

Question 18 of 20

why is light the initial energy source for almost all communities?

Select one or more of the following:

Explanation

Question 19 of 20

Why is the energy transformation presented as a pyramid?

Select one or more of the following:

Explanation

Question 20 of 20

The saprotrophic activity of decomposers (certain bacteria and fungi), free inorganic materials from the dead bodies and waste products of organisms, ensuring a continual supply of raw materials for the producers (which can then be ingested by consumers)