Life On Earth

Question 1

Natural selection is

Answer 1

Survival of the fittest

Question 2

Variation is

Answer 2

The differences in individuals of the same species

Question 3

Mutations can be classed as

Answer 3

Advantageous
Disadvantageous
Neutral

Question 4

Speciation is

Answer 4

Where a population of a species has been separated from the rest of the population by a barrier and begin to mutate and can no longer interbreed with the rest of the population and has formed a new population.

Question 5

Mutagenic agents are

Answer 5

Things which affect the rate of mutation- radiation (x ray, uv light), chemicals (dioxin)

Question 6

Barriers are

Answer 6

What separates a population of a species so speciation takes place

Question 7

Barriers examples

Answer 7

Ecological- soil ph, light intensity

Geographical- oceans, mountain ranges, desserts, rivers

Behavioral- different mating seasons, different mating songs

Question 8

Intraspecific competition is

Answer 8

Between 2+ of the same species

Question 9

Interspecific competition is

Answer 9

Between 2+ of different species

Question 10

Energy can be lost from a food chain by

Answer 10

Movement
Heat
Feces

(90% is lost each time energy is passed down)

Question 11

Biodiversity

Answer 11

All the organisms around the world

Question 12

Niche

Answer 12

An organisms role in an ecosystem

Question 13

Pyramid of numbers is

Answer 13

A pyramid used to show the order of energy flow

Question 14

Biological control is

Answer 14

Using another organisms to necessarily crop yield ( alternative to pesticides or fertilizers )

Question 15

Bioacumulation

Answer 15

The build of pesticides in an organism

Question 16

Pesticides are

Answer 16

Substances added to crops to increase crop yield- from pests

Question 17

Ferterlisers

Answer 17

Substances added to the soil to increase crop yield- natural ferterliser is feces

Question 18

GM crops (genetically modified)

Answer 18

Modified crops to increase crop yield- corn

Question 19

Leaching

Answer 19

1- Pesticides go into water
2- algae multiplies 
3- attracts bacteria 
4- bacteria eats oxygen 
5- fish die

Question 20

Plants absorb and used nitrates for

Answer 20

Turn into amino acids

Question 21

Biotic factors are

Answer 21

Grazing

Predation

Question 22

Abiotic factors are

Answer 22

PH
Temperature
Light intensity

Question 23

Indicator species

Answer 23

A species which shows us the habitat- ( level of pollution)

Question 24

Pitfall traps

Answer 24

Used to hate her information about organism if the group of…

Problems-
if it’s not level some might avoid it
If it’s not covered birds may eat the organisms inside

Question 25

Quadrant

Answer 25

Used to measure organisms in an area

Problems-
Placed- throw it randomly
In or out- decide weather if it’s half out or in and stuck to it

Question 26

PH meter

Answer 26

Measure PH of soil- use a PH meter ( must always clean probe after )

Question 27

Light meter

Answer 27

Measures light intensity ( never shadow the meter, always keep the meter at the same angle towards the sun )

Question 28

Moisture meter

Answer 28

Moisture in soil ( always clean the probe )

Question 29

Soil thermometer

Answer 29

Measure temperature of soil ( always clean probe after )

Question 30

Equation of an ecosystem is

Answer 30

Community + habitat