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Flashcards in SB9 Deck (24)
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1

What is an ecosystem?

All the organisms and the environment they live in.

2

What is a population?

A group of the same species that live in a particular area.

3

What is a habitat?

The area in which an organism or population lives.

4

What is a community?

All the different organisms that live in a particular area.

5

What does interdependent mean?

When two organisms are dependant upon each other.

6

What are producers?

Organisms that use sunlight energy to produce food.

7

What are consumers?

Organisms that get their energy by eating other organism (producers/consumers).

8

What is a primary consumer?

Gets it energy by eating plants.

9

What is a secondary consumer?

Gets its energy by eating primary consumers.

10

What is a tertiary consumer?

Gets its energy by eating secondary consumers.

11

What abiotic factors affect communities?

Temperature
Amount of water
Light intensity
Levels of pollution

12

What biotic factors affect communities?

Competitions - organisms compete with other species for the same resources.

Predators - e.g - number of lions decrease = gazelles might increase.

13

What is a quadrat?

Its a square frame enclosing a know area.

14

What do pyramids of biomass show?

Weight

15

What’s the equation for efficiency?

Energy transferred to next level/energy available at previous level x 100

16

What is eutrophication?

An excess of nutrients in water.

It can lead to death
From fertilisers - if too much is applied and rains afterwards

17

What is a non-indigenous specie?

Its one that doesn’t naturally occur in an area.

Can cause problems with indigenous species - more competition, disease.

18

How do we conserve and maintain biodiversity?

Reforestation
Conservation schemes

19

What are the benefits of maintaining biodiversity?

Protecting human food supply
Ensuring minimal damage to food chains
Providing future medicines
Cultural aspects
Ecotourism
Providing new jobs

20

What does reforestation do?

Can increase biodiversity in deforested areas.

21

What do conservation schemes do?

Protect at risk species from dying out.

Protecting a species natural habitat.
Protecting species in safe areas outside their habitat.
The use of seed banks.

22

What are biological factors affecting the level of food security?

Increasing human population.
Increasing consumption of meat, fish and increasing animal farming.
Environmental changes caused by human activity (climate change)
Sustainability
New pests and pathogens

23

What affects the rate of decay?

Temperature - warmer temp speeds it up

Water content - faster in moist environments

Oxygen availability - faster when there’s plenty of oxygen

24

What food preservation methods reduce the rate of decay?

Storing food in the fridge/freeze lowers the temperature.

Storing food in airtight cans stops microorganisms getting in.

Drying foods removes the water that microorganisms need to survive and reproduce.