Unit 3 Life On Earth

Question 0

State what a biotic factor is and name one

Answer 0

A living factor that effects biodiversity

e.g parasites

Question 1

Define an ecosystem

Answer 1

Living + non-living =ecosystem

organisms. surroundings

Question 2

State what a non-biotic factor is and name one

Answer 2

A non-living factor that effects biodiversity e.g pollution

Question 3

Define and give an example of a species habitat

Answer 3

A habitat is the place where an organism lives e.g cacti live in the desert

Question 4

Define biome

Answer 4

Biomes are the worlds major communities that are classified according to the predominant vegetation and characterised by the adaptations of organisms to that particular environment

Question 5

State the definition of a niche

Answer 5

The role an organism plays in its community

Question 6

Define population

Answer 6

In an ecosystem, a group of organisms made of one species is called a population

Question 7

Define biodivesity

Answer 7

The variety of all living things on earth, including animals, plants, fungi, bacteria and their genes

Question 8

Define community

Answer 8

A community is all the living things together in an ecosystem

Question 9

Define species

Answer 9

A group of organisms which can interbreed and produce fertile offspring

Question 10

Define intraspecific competition

Answer 10

Members of a species that are competing with each other over a resource

Question 11

Define interspecific competition

Answer 11

Members of a species that are competing with members of another species over a resource

Question 12

What is a mutation

Answer 12

A random change to genetic material

Question 13

What is a mutagenic agent and name one

Answer 13

A mutagenic agent is something that increases the rate if mutation e.g chemicals such as bromine

Question 14

What is an adaptation

Answer 14

An inherited characteristic that makes an organism well suited to its environment

Question 15

What are indicator species used for

Answer 15

They indicate the level of pollution by their prescience or absence of

Question 16

What is biological control

Answer 16

The deliberate introduction of a predator/parasite to reduce the population of another species

Question 17

What are GM crops

Answer 17

When scientists insert a useful gene from another gene into a crop plant

Question 18

What is monoculture

Answer 18

A single crop species is grown over a large area reducing the complexity of the ecosystem to a single species

Question 19

Define habitat

Answer 19

The place where an organism lives

Question 20

Algal bloom

Answer 20

A rapid growth of microscopic algae often resulting In a coloured scum at the surface

Question 21

What is variation

Answer 21

How members of the same species differ

Question 22

Speciation

Answer 22

When a new species is formed

Question 23

At each stage of the food chain what percentage if energy is lost

Answer 23

90%

Question 24

Food chain

Answer 24

A food chain shows the different organisms that live in a habitat and energy transfer

Question 25

Food web

Answer 25

A group of connected food chains

Question 26

Parasitism

Answer 26

Parasites live of other organisms and produce nothing themselves

Question 27

Predation

Answer 27

Predation is when an organism kills and eats another organism