5.3

Question 1

Density

Answer 1

density is the number of a particular organism per square metre.

Question 2

Distribution

Answer 2

where individuals are spread or arranged across an area.

Question 3

Habitat

Answer 3

the name given to a place where an organism lives

Question 4

Ecosystem

Answer 4

A dynamic system of organisms that interact with each other and the environment

Question 5

Abiotic factors

Answer 5

the non-living components of an ecosystem, such as water, temperature, light and pH.

Question 6

Biotic factors

Answer 6

The living or dead components of an ecosystem

Question 7

Transects

Answer 7

A sampling method used to estimate the population of wild animals.

Question 8

Difference between ecosystem and habitat

Answer 8

An ecosystem consists of many communities of organisms that interact with each other and their environment. A habitat is an area where a species lives within an ecosystem.

Question 9

Quadrat-sampling methodaqcf

Answer 9

Quadrats are a sampling method that is used to measure the population of organisms that don’t move or move very little l

eg. starfish, mussels, clam fish

Question 10

What organisms would the quadrat sampling method be best suited to

Answer 10

Plants

Question 11

Capture recapture method

Answer 11

used to estimate the size of a population where it is impractical to count every individual

Question 12

Why is the capture recapture method less effective for larger animals

Answer 12

Larger animals tend to live in smaller populations or spread over a very large area

Question 13

why do scientists need to determine a species population

Answer 13

to conserve species

Question 14

What does regular sampling of populations do

Answer 14

provides information about increases

and decreases in population numbers.

Question 15

Types of sampling

Answer 15

quadrats
transects
capture-recapture method

Question 16

How do you estimate the average density of a total area

Answer 16

Estimated average density=

total number of individuals counted/number of quadrats x area of each quadrat

Question 17

When are transects useful

Answer 17

when the environmental conditions vary along the

sample under investigation);

Question 18

How to find the total population using capture recpature method

Answer 18

The number caught and marked x the total number recaptured/ the number marked that are recaptured

Question 19

Describe the relationship between predator and prey populations.

Answer 19

As the prey population increases, there is more food for predators

As the number of predators increases, more prey are captured.

Question 20

why does a energy pryamid only have 3 or 4 trophic levels.

Answer 20

food chain’s length is restricted to just 3 or 4 steps due to energy loss

Question 21

Environment

Answer 21

Environment refers to the type of area where an organism lives such as an aquatic or humid environment.

Question 22

Describe symbotic vs non symbotic relationships

Answer 22

Symbiotic relationships are close physical relations between two different species over a long period of time in which at least on species benefits. eg. mutalism and commensalism.

In non symbotic relationships, neither species have to benefit eg. competition and predation.