Ecology and the environment

Question 1

What is the definition of community

Answer 1

All living things, animals and plants living in a particular habitat

Question 1

What is the definition of population

Answer 1

All the members of one species living in a habitat

Question 1

What is the definition of Habitat

Answer 1

the place where organism lives

Question 1

What is the definition of Ecosystem

Answer 1

A community of living and non-living things

Question 1

What is the definition of Biodiversity

Answer 1

A measure of the variety of different species living in a habitat
(species richness)

Question 1

What is the difference between Abiotic and Biotic

Answer 1

Abiotic- non-living
Biotic- living

Question 2

list Abiotic factors which can affect the population size

Answer 2

Climate
Soil PH
Temperature
Salinity
Topography

Question 3

list Biotic factors which affect the population size

Answer 3

Predation
Grazing
Disease
Competition
Parasitism
Mutualism

Question 4

What are the names given to the different trophic levels in order

Answer 4

Producer
primary consumer
secondary consumer
Tertiary consumer
decomposer

Question 5

What is a food web

Answer 5

food web is a network of interconnected food chains. It shows the energy flow through part of an ecosystem

Question 6

what is a food chain

Answer 6

Simplest way of showing a feeding relationships within an ecosystem

Question 7

what do the arrows represent in the food chain

Answer 7

the direction in which the energy is being transferred

Question 8

why is only 10% of energy transferred from one trophic level to another

Answer 8

because not all the materials end up in the organism - some are lost

Question 9

what are some ways energy is lost between one trophic level and another

Answer 9

-Movement

-Respiration- release heat to it’s surroundings

-Not digested/ absorbed

-Some of the materials form excretory products

-Not eaten

Question 10

What is the role of nitrogen fixing

Answer 10

Converts N2 (nitrogen gas) from the atmosphere into the nitrogen compound (nitrate NO3) often found in leguminous plants

Question 11

what is often found in leguminous plants

Answer 11

Nitrate (NO3)

Question 11

What is the name of the bacteria found live in the root nodule plants.

Answer 11

Nitrogen- fixing bacteria

Question 11

what is the process where ammonia is converted to nitrites and nitrites are converted to nitrates

Answer 11

Nitrification

Question 11

what bacteria is involved in Nitrification

Answer 11

Nitrifying bacteria

Question 12

What is the process where protein in dead plants and animals is broken down
ammonia is released into the soil

Answer 12

Decomposition

Question 13

What bacteria is involved in Decomposing

Answer 13

Decomposing bacteria

Question 14

What is Denitrification

Answer 14

Nitrates are converted to nitrogen gas

Question 15

What bacteria is involved in Denitrification

Answer 15

denitrifying bacteria

Question 16

what does Denitrification do

Answer 16

Reduces the amount of nitrate in the soil and therefore makes the soil less fertile

Question 17

What is Nitrogen fixation
(hint use the word converting in your answer)

Answer 17

Nitrogen gas is converted to ammonia in bacteria which is used to make proteins, when the bacteria die their proteins decompose, releasing ammonia back into the soil.

Question 18

What bacteria is involved in Nitrogen fixation

Answer 18

Nitrogen- fixing bacteria

Question 19

where is nitrogen fixing bacteria found

Answer 19

Soil
root nodules of plants