Grade 4 - Q4: Interactions in Ecosystems

Both living and nonliving things interacting within a defined area makes up a(n) _____________.

• Organism

• Population

• Community

• Ecosystem

Predators hunt and help control the size of the populations of these organisms.

• Prey

• Predation

• Parasite

• Competitor

Which of the following is an example of a living organism interacting with a non-living thing in its ecosystem?

• Bee spreading pollen from one flower to another

• Ring-tailed lemur eats fruit from the tamarind tree

• Water vapor condensing into water droplets onto tiny pieces of dust in the air to form clouds

• Deer breathes in oxygen from the air

Aquatic animals (such as fish) eat tiny water insects, worms and plankton as a means of nutrients for survival.

• Mutualism

• Predation

• Competition

• Parasitism

Which of the following is an interaction between 2 living organisms?

• Barn owl capturing a mouse in its talons to eat

• Wind blows sediment from one sand dune to another

• Heat from the sun causing water to evaporate from the ocean

• Elephant throws mud on itself to stay cool

The picture shows living things in an ecosystem. Which organism is a producer?

• mouse

• eagle

• grass

• caterpillar

A relationship in which organisms compete or fight with one another for food and space.

• Competition

• Predation

• Commensalism

• Parasitism

A relationship in which one organism benefits without harming or affecting the others.

• Competition

• Predation

• Commensalism

• Parasitism

An interaction where one organism hunts, kills and feeds on a weaker animal.

• Competition

• Predation

• Commensalism

• Parasitism

A relationship between two different organisms wherein one benefits at the expense of the other.

• Symbiosis

• Mutualism

• Predation

• Parasitism