Biotic factors

What is a food chain?

the transfer of energy from sun through plants and various consumers

What is a food web?

food chains that are linked to one another and consists of all food chains in ecosystem

What are trophic levels?

the feeding level of an organism in an ecosystem

Different trophic levels (5)

• 1st level:

  • producers (most energy)

• 2nd level:

  • primary consumers

• 3rd level:

  • secondary consumers

• 4th level:

  • tertiary consumer

• decomposers can occur at any level

How does the transfer of energy work?

90% of the energy is used for organisms life processes and 10% gets carried over into next trophic level when the organism is consumed

Different ecological pyramids (3)

• number pyramid

• biomass pyramid

• energy pyramid

Diagram of different ecological pyramids