IB ESS Topic 2.1 to 2.3

A system made up of organisms interacting with one another

• biology

• society

• ecosystem

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

How does energy enter an ecosystem?

• sunlight

• soil

• animals

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

The non-living parts of an ecosystem, such as water, sun, & oxygen are called 

• habitat
• abiotic factors
• biotic factors
• ecology

All the populations in an ecosystem are called a 

• climate
• population
• community
• habitat

The living factors of an ecosystem, such as plants, animals, & fungi are called

• biotic factors
• abiotic factors
• ecosystem
• population

An important abiotic factor in ALL ecosystems is the 

• ecology
• climate
• plants
• animals

All life on Earth exists in a region known as 

• an ecosystem
• a biome
• the biosphere
• ecology

Autotrophs are organisms that

• rely on other organisms for their energy & food supply.
• consume plant & animal remains and other dead matter.
• use energy they take in from the environment to convert inorganic molecules to organic molecules.
• obtain energy by eating only plants.

The total mass of living tissue at each trophic level can be shown in a(n)

• energy pyramid
• pyramid of numbers
• biomass pyramid
• biogeochemical cycle

Why are food chains, such as the one shown, limited to 4-5 organisms?

• There are not more organisms in the ecosystem
• Organisms must share resources
• Energy transfers are inefficient
• They are only limited when organisms are living on land.