4.7 Organisation of an ecosystem and recycling Flashcards Preview

11B1 - AQA Biology Trilogy > 4.7 Organisation of an ecosystem and recycling > Flashcards

Flashcards in 4.7 Organisation of an ecosystem and recycling Deck (50)
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1

photosynthetic organisms are known as

producers

2

Feeding relationships can be represented as a

food chain

3

all food chains begin with..

a producer

4

a plant is known as a producer because...

its produces its own food!

5

Plants make glucose in what process?

photosynthesis

6

What piece of equipment would you use to estimate population size?

quadrat

7

What piece of equipment would you use to measure change in distribution of an organism from one area to another?

tape measure - use to make a transect

8

The mean is

the average - add up all the data and divide by how many you have

9

The mode is....

the most popular/number that occurs most frequently

10

The median is

the middle value - once all data has been organised into numerical order

11

An organism that eats other animals is known as a

predator

12

Animals that are hunted and eaten by other animals are called

prey

13

In a stable community what happens to the number of predator and prey?

rises and falls in cycles

14

carbon is returned to the atmosphere as

carbon dioxide

15

What process returns carbon dioxide to the atmosphere?

respiration

16

which process removes carbon dioxide from the atmosphere?

photosynthesis

17

Which organisms carry out decay?

microbes/micro-organisms

18

What conditions are necessary for decay?

warmth, moisture, energy source and oxygen

19

What is biomass?

dry mass, energy store - makes up the living material of all living organisms

20

The population size of any species is limited by..

food availability

21

If food availability increases (prey) what will happen to the predator population?

increase

22

If the predator population increases what will happen to the prey population?

decrease

23

Predator and prey cycles are always out of phase with each other -what does this mean?

It takes a while for one population to respond to the other population

24

What does the energy from the sun do to the water on the land and in the sea?

causes it to evaporate and turn to water vapour

25

Evaporation of water from plants is known as

transpiration

26

When water vapour evaporates it is carried upwards. What happens to it when it gets higher up?

it cools and condenses to form clouds

27

Water in clouds falls as rain - what is known as?

precipitation

28

When rain falls onto the land where does it eventually end up?

drains into the sea

29

All living things are made up from the elements ...

Carbon
hydrogen
oxygen
nitrogen

30

What biological molecules contain carbon?

carbohydrates, proteins and fats