Grade 7 Life Science Unit 2 Test

Front 1

Biotic Factors

Back 1

A living part of an ecosystem.

Example: Plants, Animals

Front 2

Abiotic Factors

Back 2

A non-living part of an ecosystem.

Example: Dead Plants & Animals

Front 3

Limiting Factor

Back 3

An environmental factor that prevents a population from increasing.

Example: 10 Bunnies may live in a place that has enough water, cover & space to support 20 bunnies.

Front 4

Population

Back 4

All the members of one species in a particular area.

Example: Over 8 million people live in New York City.

Front 5

Community

Back 5

All the different popluations that live together in an area.

Example: Where people meet and chant together

Front 6

Biome

Back 6

A Group of ecosystems with similar climates & organisms.

Example: Tundra, Deserts, Taiga

Front 7

Habitat Fragmentation

Back 7

Breaking larger habitats into smaller, isolated pieces or fragments.

Example: Humans polluting the Earth

Front 8

Poaching

Back 8

The illegal killing or removal of wildlife species.

Example: Killing endangered species is illegal

Front 9

Primary Succession

Back 9

The series of changes that occur in an area where no ecosystem exists.

Example: volcano explodes and makes new bare rock

Front 10

Secondary Succession

Back 10

Series of changes that occur after a disturbance in an existing ecosystem.

Example: Forest fires, farmers plow fields

Front 11

Pioneer Species

Back 11

The first organsims to population a new site.

Example: Lichens, Mosses

Front 12

Emigration

Back 12

Moving out of a population.

Example: deer exiting a population

Front 13

Immigration

Back 13

Moving into a population.

Example: Deer entering a population

Front 14

Birth Rate

Back 14

The number of births in a population in a certain amount of time.

Example:

Front 15

Sampling

Back 15

Count the number in a measured area then times (X) by the total area.

Example: 36 Bears Times 100 feet = 3600

Front 16

Carrying Capacity

Back 16

The largest popluation that an area can support.

Example: 10,000 insects is the max

Front 17

Non-native (exotic species)

Back 17

Species introduced either accidentally or deliberately by a humans actions.

Example: house sparrow, pigeon

Front 18

Biodiversity

Back 18

The number of different species in an area.

Example: birds, snakes, bears, humans all in the same area

Front 19

Tropical Rainforest

Back 19

Warm, humid, lots of rain, lots of plants and animals like a sloth.

Front 20

Desert

Back 20

Little rain, lots of sunlight, cactus, scorpion.

Front 21

Taiga/Boreal Forest

Back 21

Coniferous (pine trees), cold weather, moose.

Front 22

Deciduous Forest

Back 22

Eastern United States (our biomel), trees lose their leaves in the fall.

Front 23

Grassland

Back 23

Grass, small trees and shrubs, Giraffes, zebras, antelopes, warm temperatures, seasonal rainfall.

Front 24

What are two reasons tropical rainforests have the most plan growth of any type of biome?

Back 24

Because of the rain and sunlight.

Front 25

If birth rates are greater than death rates the population will...

Back 25

increase.

Front 26

What also influences a population besides birth rate and death rate?

Back 26

immigration, emigration

Front 27

Why do non-native (exotic) species threaten native species?

Back 27

because they can endanger other species that live there.

Front 28

How can humans best help an endangered species avoid extinction?

Back 28

Put them into captive breeding.

Front 29

What would be a factor in a desert ecosystem that would limit the carrying capacity for plant life?

Back 29

Water

Front 30

A volcano eruption would result in which type of succession?

Back 30

Bare Rock

Front 31

Using arrows, show the order of the following species that would grow after a volcanic eruption. (Trees, Lichens, Shrubs, Grasses)

Back 31

Lichens, Shrubs, Grasses, Trees

Front 32

What happens to the smaller plants during secondary succession?

Back 32

Farmers can plow fields.

Front 33

Name and describe the four MAIN types of human activities that can affect biodiversity.

Back 33

Habitat destruction, poaching, pollution, introduce exotic species will all ruin the habitat.

Front 34

What is the definition of a pioneer species? Give two examples.

Back 34

The first organism to population a new site, Lichens and mosses.

Front 35

Using arrows, show the order of the following species that would grow after a field is abandoned. (hardwood trees, pine trees, small weeds, and grasses)

Back 35

grasses, small weeds, pine trees, hardwood trees