Ecosystems

Question 1

Define an ecosystem

Answer 1

Made up of all the living organisms that interact with one another in a defined area, ans also physical factors present in that region

Question 2

Define both abiotic and biotic factors

Answer 2

Abiotic factor- non living or physical factors that affect an ecosystem e.g amount of rainfall
Biotic factors- living factors that affect an ecosystem

Question 3

Define both producer and consumer

Answer 3

Producer - organism that converts light energy into chemical energy
Consumer - organism that obtain their energy by feeding on other organisms

Question 4

What is a decomposer

Answer 4

Break down dead organisms releasing nutrients back into the ecosystem

Question 5

What is biomass

Answer 5

The mass of living material present in a particular place or particular organis

Question 6

What do ecological pyramids show

Answer 6

It shows the pyramids of number,biomass and energy.

HOWEVER not all energy is consumed as energy is lost in faeces, excretory products e.g urine, heat in respiration

Question 7

What do pyramids of biomass represent

Answer 7

Represents the total dry mass of living organisms at each trophies at each trophies level

Question 8

Define autotroph, photoautotroph, chemoautroph

Answer 8

Autotroph - organism that manufactures its own food = producer
Photoautotroph- organism that manufacture its own food using light energy
Chemoautotroph- organism that manufactures its own food using energy derived from chemical reactions