Unit 3

Question 1

How can a biome be influenced

Answer 1

Rainfall

Temperature

Question 2

Examples of biomes

Answer 2

Tundra
Forests
Grassland

Question 3

Habitat

Answer 3

Place an organism lives

Question 4

Population

Answer 4

Total number of organisms of one species

Question 5

Community

Answer 5

All populations living in s habitat

Question 6

Niche

Answer 6

The role an organism plays

Question 7

Ecosystem

Answer 7

Natural biological unit made up of habitat, community’s and populations

Question 8

Niche example

Answer 8

Feeding level- producer

Question 9

Biodiversity

Answer 9

Variety of life

Question 10

Factors affecting biodiversity

Answer 10

Abiotic
Biotic
Human influence

Question 11

Biotic

Answer 11

Competition
Grazing
Predication

Question 12

Abiotic

Answer 12

PH
Light intensity
Moisture

Question 13

Human influence

Answer 13

Habitat destruction
Pollution
Hunting
Conservation

Question 14

Producer

Answer 14

Green plant - photosynthesis

Question 15

Consumers

Answer 15

Eat other organisms

Question 16

Herbivores

Answer 16

Only eat plants

Question 17

Carnivores

Answer 17

Only eat animals

Question 18

Omnivores

Answer 18

Eat plants and animals

Question 19

Food chain

Answer 19

Sun
Producers
Primary
Secondary

Question 20

Energy transfer

Answer 20

Growth
Heat and movement
Undigested material

Question 21

Decomposers

Answer 21

Breakdown Undigested waste to obtain energy

Question 22

Pyramids

Answer 22

Pyramid of numbers
-Number of organisms in each food chain

Pyramid of biomass
-mass of each organism

Pyramid of energy
-energy available at each stage in the food chain

Question 23

Nitrogen cycle

Answer 23

Necessary for protein and nucleic acid formation

PANN

Protein-ammonia-nitrite-nitrate

Question 24

Nitrification

Answer 24

Decomposes such as bacteria and fungi break down protection.
Nitrifying bacteria convert ammonium Into nitrites then nitrates

Question 25

Nitrogen fixation

Answer 25

Legumes
Peas
Clover
Root nodules

Question 26

Denitrification

Answer 26

Conversion of nitrates into nitrogen gas

Question 27

Sampling techniques

Answer 27

Pitfall trap

• traps may not be placed randomly
• too few traps used
• could eat other insects inside

Quadrat sampling

• not placed randomly
• plants misidentified

Question 28

Measuring abiotic factors

Answer 28

Soil pH meter
Light intensity- light meter
Temperature-thermometer
Moisture level- moisture meter

Question 29

ROAR

Answer 29

Repeat obtain and average to increase reliability

Question 30

Rolf

Answer 30

Mutations are random occurrence and low frequency

Question 31

Species

Answer 31

Able to interbreed and produce fertile off spring

Question 32

Variation

Answer 32

Genetic errors- mutation

Question 33

Natural selection

Answer 33

Survival of the fittest

Question 34

Speciation

Answer 34

Isolation
Mutation
Natural selection
Speciation

Question 35

Adaptation examples

Answer 35

Camel

Long eyelashes and ears covered with hairs to keep sand out its eyes
Wife foot to prevent sinking in sand

Arctic fox

Coat changes colour during seasons when stalking pray
Small ears to prevent heat loss

Question 36

Human population

Answer 36

Organisms that by their presence, abundance or absence can down version conditions

Question 37

Examples of biological indicators

Answer 37

Sludge worm - polluted river, low
oxygen

Mayfly- heigh oxygen, clean river

Question 38

What is a biome

Answer 38

Are geographical regions on the planet with a distinctive group of plants and animals

Question 39

Air pollution indicator species

Answer 39

Crusty lichen - high SO2 conc

Crusty lichen and leafy - medium