Food chains are organised into trophic levels. Energy flows from lower levels to higher ones. Pyramids of number and biomass represent the number of organisms and their mass at each trophic level.
What type of organism starts all food chains?
What do the arrows in a food chain represent?
The flow of energy
The flow of heat
The flow of water
Which of these is likely to be a herbivore?
What would happen to the numbers of owls if a new predator which ate shrews was introduced into this food web?
Their population would increase
Their population would decrease
Their population would not change
Which organisms are decomposers?
Bacteria and fungi
Bacteria and viruses
Fungi and viruses
How do decomposers digest dead material?
They release hormones and then absorb digested material
They release enzymes and then absorb digested material
They eat them and digest them internally
What chemical reaction do almost all consumers complete?
In a food chain, which trophic level represents the producer?
What type of animal eats both plants and animals?
What type of animal is found on the second trophic level?