Dist. of organisms 3.2

Question 1

what is a biotic factor ,

Answer 1

a living factor that effects an organisms niche

Question 2

name 5 biotic factors

Answer 2

grazing, predation, food availability, disease, competition

Question 3

what is an abiotic factor

Answer 3

a non-living factor that effects and organisms niche

Question 4

state 4 abiotic factors

Answer 4

pH, temperature, moisture, light intensity

Question 5

what do you use to sample light intensity

Answer 5

light metre

Question 6

at is one mistake you can do when sampling light intensity

Answer 6

casting your own shadow over it

Question 7

what do you use to measure temperature

Answer 7

thermometer

Question 8

what is an error you can make when using a thermometer

Answer 8

not leaving it in for long enough

Question 9

how do you measure pH

Answer 9

pH meter

Question 10

what is an error you can make while measuring pH

Answer 10

it gets contaminated as you dont wipe it down before every use

Question 11

how do you measure soil moisture

Answer 11

moisture meter

Question 12

what is an error you can make when using a moisture meter

Answer 12

dont wipe it down before every use (contamination)

Question 13

how do you use a quadrat

Answer 13

you throw it randomly multiple times in an area ,the number of squares containing the species you are sampling is counted this is called the abundance

Question 14

what does a pitfall trap do

Answer 14

it samples the number of ground invertabrates

Question 15

an error when using pitfall traps

Answer 15

not camouflaging it to ensure predators dont eat the captured organisms

Question 16

what is a transect line

Answer 16

Transects can be used to give a picture across an area.
A line is taken from one point to another and samples are taken at set points along the line.

Question 17

what is an indicator species

Answer 17

it indicates the pollution levels and the environmental quality depending on its presence or absense