A pyramid of numbers

What does each bar in a pyramid of numbers represent?

• Size of the ecosystem

• Types of organisms

• Number of individuals at each trophic level

• Amount of energy lost

What is the relationship between predator and prey populations?

• They have no impact on each other

• They are completely independent

• Only predators affect prey

• Affect each other's population size

What factors affect the rate of population growth?

• Only disease

• Only predation

• Only food supply

• Food supply, predation, disease, and cold winter

What are some human negative activities that have affected habitat changes?

• Reducing pollution

• Planting more trees

• Overfishing, overhunting, selling body parts, and fur

• Protecting wildlife habitats

What happens when the prey population grows?

• Predator numbers remain the same

• Predator numbers decrease

• Prey numbers decrease

• Predator numbers increase

What is a population in an ecosystem?

• A group of plants only

• A group of different species

• A group of organisms of different species

• A group of organisms of one species

What is the continuous tussle between predators and prey?

• A friendly relationship

• A symbiotic relationship

• A struggle for survival

• A neutral relationship

What is the impact of growing predator numbers on the food supply?

• Food supply remains the same

• Food supply decreases

• Food supply becomes unlimited

• Food supply increases

What is the time lag in population size change for predators and their prey?

• They change simultaneously

• Predator numbers increase first

• Predator numbers increase after prey numbers drop

• Prey numbers increase first

What do all living things within an ecosystem depend on?

• Weather conditions

• Human activities

• Geographical location

• Each other