Edexcel IGCSE Biology - Random Things

includes random things from topics i don't have complete flashcard sets for; and corrections from past papers

feeding relationships: why is only 10% of energy transferred to the next tropic level?

• some is lost through respiration and movement

• some is lost as heat

• not all organism is eaten

• some is lost through excretion and egestion of waste

feeding relationships: why are there not many tropic levels?

only 10% of energy is transferred from one to the next - if there were many the top would not have enough energy to survive

feeding relationships: what are the 3 kinds of pyramids?

• pyramids of number (not always pyramid-y)

• pyramids of biomass

• pyramids of energy

feeding relationships: what do each of the three pyramids look like?