Flashcards in 4.7 Organisation of an ecosystem and recycling Deck (50)
photosynthetic organisms are known as
Feeding relationships can be represented as a
all food chains begin with..
a plant is known as a producer because...
its produces its own food!
Plants make glucose in what process?
What piece of equipment would you use to estimate population size?
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
The mean is
the average - add up all the data and divide by how many you have
The mode is....
the most popular/number that occurs most frequently
The median is
the middle value - once all data has been organised into numerical order
An organism that eats other animals is known as a
Animals that are hunted and eaten by other animals are called
In a stable community what happens to the number of predator and prey?
rises and falls in cycles
carbon is returned to the atmosphere as
What process returns carbon dioxide to the atmosphere?
which process removes carbon dioxide from the atmosphere?
Which organisms carry out decay?
What conditions are necessary for decay?
warmth, moisture, energy source and oxygen
What is biomass?
dry mass, energy store - makes up the living material of all living organisms
The population size of any species is limited by..
If food availability increases (prey) what will happen to the predator population?
If the predator population increases what will happen to the prey population?
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
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
Evaporation of water from plants is known as
When water vapour evaporates it is carried upwards. What happens to it when it gets higher up?
it cools and condenses to form clouds
Water in clouds falls as rain - what is known as?
When rain falls onto the land where does it eventually end up?
drains into the sea
All living things are made up from the elements ...