Topic 9- Ecosystems and Material Cycles Flashcards Preview

Biology > Topic 9- Ecosystems and Material Cycles > Flashcards

Flashcards in Topic 9- Ecosystems and Material Cycles Deck (22):
1

Species is...

Organisms that can reproduce and produce fertile offsprings

2

Organisms are ...

A living thing

3

Population ...

A group of organisms that all belong to the same species

4

Community...

All the organisms that live in a particular habitat

5

Habitat...

Where an organism lives

6

Niche...

The role an organism has in its environment (where it lives, what it does, what it eats)

7

Ecosystem...

All the living things within a given area interacting with one another

8

Environment...

All living things and non living things (weather, rocks ect.) in a given area

9

Trophies level is...

A stage or level of animals/organisms in a food chain or web which an organism is feeding

10

Consumer is...

An organism which eats the pervious trophic level to gain energy
An organism which feeds on another organism

11

Trophic level one is...

An autotroph because it will make its own food

12

Order of food chain (eg.owl)

1. Producer eg. Plant
2. Herbivore/consumer eg. Insect
3. Omnivore/consumer eg. Mouse
4. Carnivore/consumer eg. Owl

13

A food chain...

Shows the path of energy from one living thing to another

14

Energy is lost each trophic level through...

Life processes, respiration (in mitochondria + include equation) used to transfer energy for movement, heat ect. which is not past onto the next trophic level
Energy stored as biomass which makes new cells to grow ect.
Also not all the organism may be consumed/eaten by the consumer
Not all the organism can be digested which becomes waste (faeces)

15

Biomass is...

The mass of living materials are that makes up an organism
Energy is stored in this material

16

Food chains and webs rarely have more than 4 to 5 trophic levels because...

If chains were longer there would not be an efficient amount of energy passed on for the organism in the higher trophic levels to survive
Energy is lost through trophic levels (see other revision card)

17

Efficiency calculation

Efficiency = energy transferred to the next trophic level / energy available at previous trophies level
X 100

18

An abiotic factor is...

An environmental factor that may have an effect on yliving organisms
Also non living
Eg...

19

A biotic factor is...

Caused by a living organism having an effect on another organism
Eg...

20

Examples of abiotic factors are...

Air temperature
Water availability
Light intensity
Levels of pollutants

21

Examples of biotic factors are...

Competition
Predation

22

Increased temperature affects on animal and plant population

Animal... may change distribution of animals
eg. Birds may migrate to warmer countries

Plants... may not be able to withstand higher temperatures, enzymes may denature and plants may die