Unit Test Review

Question 1

What are the 4 trophic levels

Answer 1

Producer
Primary consumer
Secondary consumer
Tertiary

Question 2

Trophic level

Answer 2

Feeding level of one or more organisms in a food web

Question 3

Scavengers

Answer 3

An animal that feeds on dead plant or animal material

Ex vulture

Question 4

Detritivores

Answer 4

Organisms that consume dead plant material and animal waste.

Feed at all trophic levels
Ex earthworm

Question 5

Decomposers

Answer 5

Varios bacteria and fungi that break down dead material and waste and extract the remaining nutrients

Question 6

When an animal takes in food what percentage goes where

Answer 6

Cellular respiration -30%
Growth-10%
Waste-60%

Question 7

3 elements that make a carb

Answer 7

Hydrogen
Oxygen
Carbon

Question 8

Photosynthesis equation

Answer 8

Carbon dioxide+ water+ light energy —>carb+oxygen

Question 9

Cellular respiration equation

Answer 9

Oxygen+carb—->carbon dioxide+water+ thermal energy

Question 10

4 most elements

Answer 10

Hydrogen
Oxygen
Nitrogen
Carbon

Question 11

What type of plants bring lots of carbon

Answer 11

Legumes like alfalfa,clover and beans because the rhizobia on their roots attracts nitrogen and fixes it.

Question 12

What 2 ions does nitrogen make

Answer 12

NH4

NO3

Question 13

Nitrogen overload

Answer 13

When more nitrogen is added to the environment then can be absorbed.

Question 14

Nitrogen saturation

Answer 14

When excess nitrogen washes from the soil into streams and ground water because it wasn’t absorbed. I

Question 15

Effects of nitrogen saturation

Answer 15

Stunted plant growth
Yellow needles
Damaged roots

Question 16

How is nitric acid formed

Answer 16

When nitrogen containing gases from industrial smokestacks dissolve in the moisture in the air.

Question 17

Eutrophication

Answer 17

The buildup of nutrients in an aquatic ecosystem.

Question 18

Algae bloom

Answer 18

The added nitrates initially create a population explosion of algae in warm surface waters.

Question 19

Biodiversity

Answer 19

The variety of living creatures in an ecosystem.

Question 20

Monoculture

Answer 20

Only 1 type of organism in an area

Question 21

Biological magnification

Answer 21

When certain harmful substances like pesticides move up through a food chain

Question 22

Density dependent

Answer 22

Occur due to the degree of overcrowding

Question 23

Density independent

Answer 23

Occur regardless of population

Question 24

Poaching

Answer 24

Illegal hunting or fishing

Question 25

Nitrifying bacteria

Answer 25

Bacteria that can convert ammonia to nitrates

Question 26

Nitrification

Answer 26

The conversion of ammonia to form nitrates

Question 27

Denitrification

Answer 27

The process of converting nitrates to nitrogen gas

Question 28

Denitrifying bacteria

Answer 28

Bacteria that can convert nitrates to form nitrogen gas

Question 29

MESEA

Answer 29

Manitoba endangered species and ecosystems act

Question 30

MESEA LAWS

Answer 30

It is unlawful to kill,injure or process Any of these species To destroy.or interfere with their habitat Damage natural resources

Question 31

Extirpitated

Answer 31

Species that were once native to Manitoba but have disappeared May be found in captivity

Question 32

Endangered

Answer 32

Species that are at risk of disappearing

Question 33

Threatened

Answer 33

Species likely to become endangered

Question 34

Special concern

Answer 34

Species that are at risk of being threatened or endangered.

Question 35

Reasons for ecosystem loss

Answer 35

``` Habitat loss Alien invasion (new species out competing native species) Earths change in climate ```

Question 36

Ways to help reduce threatened species and ecosystems.

Answer 36

Reduce waste Drive less Protect m.e.s.e.a species and ecosystems

Question 37

Ways humans impact the environment

Answer 37

- deforestation - over harvesting - excess carbon use - putting non native species into a new ecosystem. - desertification

Question 38

Carrying capacity

Answer 38

When a population has reached an amount where growth can no longer occur.

Question 39

Describe the growth curve at region one

Answer 39

- organisms may be adjusting to the environment. | - only a small number are sexually mature

Question 40

Describe the growth curve from the second region two

Answer 40

- many organisms have reached sexual maturity | - organisms have adjusted to environment

Question 41

Describe the growth curve from the 3rd region (top)

Answer 41

- carrying capacity has been reached | - number of deaths equals the number of births.

Question 42

How can DDT from the south cause harm to a creature in Canada?

Answer 42

From organisms that migrate consuming DDT and bringing it back with them. Due to importing food from a place that uses DDT.

Question 43

Why can't some organisms use nitrogen without it being fixed?

Answer 43

Because nitrogen molecules have a triple bond which make it very difficult for plants and animals to break down.

Question 44

What are 2 things that can break down nitrogens triple bond

Answer 44

Lightning | Nitrogen fixing bacteria