Ecology And The Environment

Question 1

Name the first 4 trophic levels

Answer 1

Producer
Primary consumer
Secondary consumer
Tertiary consumer

Question 2

What do the arrows in a food chain represent

Answer 2

The transfer of energy

Question 3

What is a producer

Answer 3

An organism that creates its own food or energy

Question 4

Population définition

Answer 4

All the organisms of the same species in a habitat

Question 5

Community definition

Answer 5

All the different species in a habitat

Question 6

Habitat definition

Answer 6

The place where an organism lives

Question 7

Ecosystem definition

Answer 7

A community of organisms interacting with their physical environment

Question 8

Biodiversity definition

Answer 8

A range of plants and animals

Question 9

What is biomass

Answer 9

The total mass of biological material at each level of a food chain

Question 10

What is a pyramid of number

Answer 10

Shows the number of organisms in each trophic level in a food chain

Question 11

What is a pyramid of biomass

Answer 11

Shows the total amount of biomass of the organism in each trophic level

Question 12

What ways is biomass lost at each level.

Answer 12

Used in respiration
Some food isn’t eaten
Lost as heat to surroundings
Lost in urine and faeces

Question 13

Biotic factors affecting the distribution of organisms

Answer 13

Predation
Disease
Availability of food
Availability of mates

Question 14

Abiotic factors affecting the distribution of organisms

Answer 14

Rainfall
O2 content
Temperature
Soil condition
Pollution
Hours of sunlight

Question 15

Why is nitrogen so important to living organisms

Answer 15

Amino acids - proteins
DNA

Question 16

How are nitrates absorbed by plants

Answer 16

Uptake by roots by active transport using root hair cells

Question 17

Green house gases

Answer 17

CO2
Méthane
Nitrous oxides
Water vapor
CFCs

Question 18

Consequences of global warming

Answer 18

Melting of ice caps
Rise in sea levels
Flooding
Extreme weather
Habitat loss - extinction

Question 19

How is deforestation leading to an increase in CO2 levels in the atmosphere

Answer 19

Less CO2 uptake and less O2 released
CO2 is produced from decomposition and burning of dead trees

Question 20

Link between increase in greenhouse effect and global warming

Answer 20

Increase in GHGs
More heat radiation being trapped
Increasing global temperature

Question 21

Nitrogen fixation

Answer 21

Converting atmospheric nitrogen into nitrogenous compounds

Question 22

Nitrification

Answer 22

Converting ammonia ions into nitrites then nitrates

Question 23

Uptake

Answer 23

Plant take up nitrate ions by active transport and use them to make proteins

Question 24

Consumption

Answer 24

Animals eat the plants which transfers the nitrogenous compounds

Question 25

Decomposition

Answer 25

Proteins in dead plant and animals are broken down and converted back to ammonium ions

Question 26

Denitrification

Answer 26

Nitrates are converted back to nitrogen gas, using up the oxygen