What do the arrows in a food chain show?
The transfer of biomass
What eats what
How many organisms are at each trophic level
What is an omnivore?
An organism which eats only meat
An organism which eats meat and plants
An organism which eats only plants
What must be true of a primary consumer?
It eats meat and plants
It eats secondary consumers
It eats plants
What must be true about the bars on a pyramid of biomass?
They decrease in size up the pyramid
They must have a big bar at the top for parasites
They must have a small bar at the bottom representing a tree
What proportion of energy biomass is transferred between trophic levels?
100%
10%
90%
What proportion of the energy reaching the leaf is used in photosynthesis to increase the plant's biomass?
1%
Which of these is NOT true when drawing pyramids of biomass?
Producer at the top
Bars equally spaced around the midpoint
Bars touching
Which of these is NOT true about food chains?
The arrows show the transfer of biomass
The Sun is the source of all energy for all food chains
They can be grouped together to form food webs
What can pyramids of biomass also show?
Food webs
The number of organisms
Energy
Why are food chains usually no longer than six trophic levels?
Only 10% of energy is transferred
There are fewer prey than predators
They all start with a producer