Unit 3 Ecosystem Retest

The graph below shows the population sizes of jaguars and iguanas from the rainforest ecosystem over time. What relationship between predators and prey in an ecosystem is supported by the graph?

• Predator populations increase after prey populations increase.

• Prey populations increase after predator populations increase.

• Predator and prey populations do not affect each other.

• Predator populations are always larger than prey populations.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-2

What is the total number of organisms that compete for mice AND dragonflies in this ecosystem?

• Four

• Five

• Six

• Seven

Tags

NGSS.MS-LS2-1

A remora is a fish that has an adhesive disk on the back of its head that it uses to attach itself to a large shark. When food floats away from the shark’s mouth as it feeds, the remora collects the scraps. The relationship between the remora and the shark is an example of —

• Predation

• Parasitism

• Commensalism

• Competition

In what order are the levels in the diagrams?

• Population → community → ecosystem

• Organism → community → population

• Organism → population → community

• Ecosystem → population → community

Which hierarchical organization did the student describe INCORRECTLY?

• Community

• Population

• Organism

• Ecosystem

Which of the following best describes a population in an ecosystem?

• All the nonliving things in an area

• All the members of one species living in an area

• All the plants in an area

• All the different species living in an area

Which of the following is most likely to decrease if a new predator is introduced into the rainforest ecosystem?

• The number of plant species

• The amount of sunlight available

• The rainfall in the ecosystem

• The population of prey species

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the main difference between a population and a community?

• A community is made up of non-living things only.

• A population is larger than a community.

• A population includes multiple species, while a community includes only one species.

• A population includes only one species, while a community includes multiple species.

Which of the following best describes an ecosystem?

• A group of organisms of the same species living together

• All the living and non-living things interacting in an area

• All the animals in a forest

• A single organism and its environment

Which statement best describes the relationship between banana trees and palm trees in the same environment?

• They compete for sunlight and soil resources.

• They compete for animal prey.

• They provide food for each other.

• They avoid each other completely.

Tags

NGSS.MS-LS2-1