Ecology: Feeding relationships

Question 1

Trophic Level

Answer 1

The position of an organism in a food chain

Question 2

Order of Trophic Levels (Bottom to Top)

Answer 2

Producer, Primary Consumer, Secondary Consumer, Tertiary Consumer, (Quaternary Consumers)
Top of chain is predator
All levels link to decomposers

Question 3

Arrows point towards

Answer 3

Direction of transfer of energy

Question 4

Food Web:
Benefit

Answer 4

A network of interconnected food chains
Shows interdependence between populations

Question 5

Pyramid of numbers

Answer 5

Shows the number of organisms at each level of a food chain

Question 6

Pyramid of biomass

Answer 6

Shows total mass organisms at each level would have without including the water inside the organisms (dry mass)
Always pyramid shaped

Question 7

Pyramids of energy

Answer 7

Shows amount of energy contained within the biomass of individuals within different trophic levels

Question 7

Producers convert light energy into
biomass is a store of

Answer 7

chemical energy in photosynthesis - glucose and oxygen
biomass is a store of chemical energy

Question 8

How is chemical energy transferred between organisms

Answer 8

Predator breaks down biomass of primary consumer(digestion) and use the chemical energy to increase/sustain their own biomass

Question 9

Why is only 10% of energy transferred between each trophic level

Answer 9

Losses of energy due to:
Organisms not eating every part of the organism they are consuming
Not all ingested material is digested and absorbed, some egested as faeces
Energy used for movement
Energy used to generate heat
Energy used for metabolic processes
Some absorbed material lost as waste:
CO2 and water waste products of respiration
Water and urea waste products in urine