Prcticalss Flashcards
Reaction time
Method
1. Sit down on the chair and place vour torearm of your weaker/non-dominant hand on the table with your hand hanging over the end of the table.
2. Have vour partner hold a ruler with the bottom end in between your fingers so you can practice holding the ruler with 2 fingers.
3. Have your partner hold the ruler and remove your fingers.
4. Have your partner hold the ruler in line so that the 0 mark is level with the top of your thumb.
Your partner will drop the ruler without telling vou beforehand, and you will catch the ruler as quickly as vou can.
6. Note and record the number level with the top of your thumb after you have caught the ruler in a table such as below.
7. Repeat the test at least 5 times
8. Swap places with vour partner and repeat steps 1-7
Find reaction times by using a conversion table to convert the ruler measurements
Feild investigation A
Method for part A
use a random number denerator to obtain numbers. which are to be used as coordinates
to find a location on the 2 tape measures set up.
2. Set down the quadrat at the coordinates.
3. Count and record the number of the required plant species in the quadrat.
4. Repeat steps 1-3 to take 9 more samples.
5. Estimate the population size using this formula:
area sampled / total area × number of plant species counted
Feild instigation B
Method for part B
1. Write down a hypothesis of the effect of a change in an abiotic factor (ea. light intensity) or the distribution of the plant species.
Lay down a tape measure trom the base of a tree to an open area of ground along a location with an ecological gradient
3. Place the quadrat along the 0 end of the tape measure, with one corner touching the ‘0 mark.
4 Count the number of plants and record it in a table as seen below
5. Place the quadrat 5 m up the tape measure and repeat step 3.
6. Repeat step 4 at 5 m intervals until you reach the end of the transect line
7. Gather data from your class to find the mean number of plants at each point along the transect.
8. Plot a graph of number ot plants against the ecological gradient that is observed as the distance along the transect line increases. Compare your results to your hypothesis.
