AQA A Level Chapter 13 Energy and Ecosystems

What do we call organisms that can make their own organic compounds from inorganic compounds?

• Heterotroph

• Autotroph

• Consumer

• Saprobiont

The total mass of living organic matter in a specific area at a given time.

• Biomass

• Calorimeter

• Energy

• Fresh mass

An animal that gets its energy by eating other animals.

• Producer

• Herbivore

• Carnivore

• Nitrogen fixing bacteria

An organism that gets its energy by feeding on other organisms.

• Autotroph

• Producer

• Consumer

• Plant

Organisms that feed on the dead remains of organisms and animal faeces, they are heterotrophs which secrete enzymes and digest their food externally before absorption takes place.

• Herbivore

• Autotroph

• Consumer

• Saprobionts

These show the transfer of energy from one organism to the next.

• Trophic level

• Food chain

• Calorimeter

• Photoautotroph

The total quantity of chemical energy stored in the producer's (plant) biomass, in a given area (or volume) in a given time.

• GPP

• NPP

• R

• F + R

Obtains energy from ingesting organic matter from other organisms.

• Photoautotroph

• Heterotroph

• Producer

• Chemoautotroph

Chemical energy stored in plant biomass after respiratory losses to the environment.

• GPP

• NPP

• R

• I - (F+R)

The position a species occupies in a food chain.

• Pyramid of energy

• Pyramid of biomass

• Trophic level

• Food chain level