Biology - Module 4

Question 1

What is the formula to calculate abundance from quadrants?

Answer 1

count inside box ÷ total number of boxes x total area

Question 2

What is the formula to calculate abundance using the capture recapture technique?

Answer 2

number of tagged (first capture) x total number in recapture ÷ number of tagged in recapture

Question 3

What is temperature measured with, how is it used and what are the units?

Answer 3

Measured with a thermometer.
Use it by putting the tip into the water and waiting for the result.
Units are Degrees Celsius (°C)

Question 4

What is wind speed measured with, how is it used and what are the units?

Answer 4

measured with a hand held anemometer or a ventimeter.
Use it by holding it up in the air the way the wind is going.
Units are km/h, knots, m/s or old mph.

Question 5

what is humidity measured with, how is it used and what are the units?

Answer 5

Measured with a wet and dry bulb hygrometer.
How to use:
1. read both thermometers
2. calculate difference in reading
3. use chart to read relative humidity from dry bulb reading
Units are %.

Question 6

what is light intensity measured with, how is it used and what are the units?

Answer 6

Measured with a photoelectric meter.
Use it by holding it faced up into the sky.
Units are lux

Question 7

What is pH measured with, how is it used and what are the units?

Answer 7

Measured with a pH scale.
Use it by matching your liquid or solid to the keys of the scale.
Units are pH.

Question 8

What is salinity measured with, how is it used and what are the units?

Answer 8

Measured with a refractometer.
How to use:
1. Open the prism cover
2. Place a few drops of saltwater onto the prism
3. Close cover
4. Look through the eyepiece with the refractometer directed towards a light source
5. Adjust lens focus by turning eyepiece (if needed)
Units are “0/00” = “parts per thousand”.

Question 9

How do you calculate percentage cover?

Answer 9

count boxes ÷ total boxes x 100

Question 10

What is quantitative data?

Answer 10

numbers

Question 11

What is qualitative data?

Answer 11

non numbers

Question 12

what are the three variables?

Answer 12

1. dependent variable - measure
2. independent variable - change
3. controlled variable - kept same

Question 13

what is control?

Answer 13

no change and no comparison

Question 14

How do you know something is valid?

Answer 14

How ccurately the method measures what it is intended to measure

Question 15

How do you know if something is reliable?

Answer 15

repeat more than 10 times.

Question 16

How do you measure population distribution ?

Answer 16

Using a transect line.
A transect is a straight line that cuts through a natural landscape so that standardized observations and measurements can be made.