4.7.2.1 Levels of Organisation

Question 1

How can feeding relationships within a community be represented?

Answer 1

• food chains

Question 2

What do all food chains begin with?

Answer 2

• producer
• synthesises molecules
• always photosynthetic organisms
• make glucose through photosynthesis
• glucose is used to make other biological molecules in the plant, making up the biomass

Question 3

What are producers eaten by?

Answer 3

• primary consumers
• energy is transferred through organisms in an ecosystem when one is eaten by another

Question 4

What are primary consumers eaten by?

Answer 4

• secondary consumers
• animals eaten are prey
• consumers that kill and eat them are predators

Question 5

What are secondary consumers eaten by?

Answer 5

• tertiary consumers

Question 6

How do you work out the distribution and abundance of species in an ecosystem?

Answer 6

• using transect and quadrats
• then can calculate mean, mode, median and draw a graph

Question 7

What will a stable community show?

Answer 7

• population cycles between predators and prey

Question 8

What happens if the population of prey increases?

Answer 8

• population of predators will also increase
• will result in the number of prey decreasing after some times as more would be consumed
• then population of predators will decrease as there isn’t enough prey, leading to population of prey increasing again