sampling

Question 1

What is sampling

Answer 1

a way to count the number of organisms in an area

used for smaller insects and mammals.

Question 2

what is a quadrat

Answer 2

square frames of wire placed on the ground to look at plants or slow moving animals

Question 3

what are quadrat’s used for

Answer 3

to record the number of individual species
to record the number of different species
the percentage that is covered by one species

Question 4

what is random sampling

Answer 4

placing quadrats at random coordinates

Question 5

what is a transect

Answer 5

used for systematic sampling when you place quatrats at at regular distances down an imaginary line

Question 6

formula for estimating population

Answer 6

area divided by quadrats multiplied by amount

Question 7

reliability means…

Answer 7

REPEATS! TEN OR MORE

Question 8

how to use a transect

Answer 8

tape measure, place quadrats at same distance, along the line. count how much of what youre counting is in each quadrat

Question 9

what does DICOR mean

Answer 9

dependent variable
independent variable
control
organisms
repeats

Question 10

what is a dependent variable

Answer 10

data (number of what youre counting)

Question 11

what is an independent variable

Answer 11

the thing you change

Question 12

what is a controlled variable

Answer 12

what stays the same (weather, time of day)

Question 13

what do you write about the organisms

Answer 13

same species? same sex? same age?

Question 14

how many repeats?

Answer 14

10 more more

Question 15

how to calculate the mean

Answer 15

add values together and divide by the amount of values

Question 16

how to calculate the median

Answer 16

place numbers in ascending order, the median is the middle number in the list (cross numbers from each end until you get the middle number)

Question 17

how to calculate the mode

Answer 17

the value that appears most often

Question 18

what is biomass

Answer 18

living or recently dead tissues

Question 19

what do pyramids of biomass look like

Answer 19

bars equally spaced around the midpoint

length of each bar is proportional to the amount of biomass

Question 20

what do the arrows in a food chain show

Answer 20

the transfer of biomass from one organism to another —>

Question 21

how much biomass is transferred to each trophic level

Answer 21

10% transferred

Question 22

how is biomass lost

Answer 22

not all matter is digested.

some is excreted by waste, carbon dioxide, water an urine

Question 23

why are food chains not often longer than 5 levels

Answer 23

biomass is lost so there is not enough energy for another trophic level to survive

Question 24

what are pyramids of numbers and what shape are they

Answer 24

they show the numbers at any trophic level and can be any shape

Question 25

what is a pyramid of biomass and what shape are they

Answer 25

thy show the mass of organisms at each trophic level and they are always pyramid shaped because mass is lost at each stage

Question 26

what is a pyramid of energy and what shape are they

Answer 26

they show the flow of energy into each trophic level and they are always pyramid shaped because energy is lost at each stage