Exam

Question 1

Reaction Time practical purpose

Answer 1

To measure how quickly someone responds to a stimulus

Question 2

Reaction time step by step

Answer 2

1. One person sits with their arm resting on a table.
   
   2. Another person holds a ruler vertically, with the 0cm mark level with the thumb.
   3. Without warning, they drop the ruler.
   4. The person tries to catch it as quickly as possible.
   5. Measure the number on the ruler where it was caught.
   6. Convert distance to reaction time using a conversion table or formula.

Question 3

Reaction time practical variables

Answer 3

• Independent: What changes (e.g. distractions like music)
• Dependent: Distance ruler falls / reaction time
• Control: Same person, same ruler, same height

Improvements: Use a computer-based reaction timer for better accuracy.

Question 4

How can you improve the reaction time practical

Answer 4

Improvements: Use a computer-based reaction timer for better accuracy.

Question 5

Using quadrants

Answer 5

• Place a 1m² quadrat randomly.
• Count a species (e.g. daisies).
• Repeat in multiple places.
• Calculate the mean number per quadrat.

Question 6

Purpose of Field Investigation: Distribution of Organisms

Answer 6

To study how the number and type of plants change in an area.

Question 7

Using Transects:

Answer 7

• Lay a tape measure along a path (e.g. from shade to sunlight).
• Place quadrats every few metres.
• Count plants in each.
• Record how abundance changes along the line.

Question 8

Field Investigation: Distribution of Organisms variables

Answer 8

Independent: Position (distance along transect)
• Dependent: Number of organisms
• Control: Size of quadrat, time of day

Question 9

What does the ruler drop test measure?

Answer 9

Reaction time

Question 10

Why should you repeat the reaction time test and calculate a mean?

Answer 10

To make the results more reliable

Question 11

What is a quadrat used for in ecology?

Answer 11

To estimate the abundance of a species in an area

Question 12

What does a transect help you find out?

Answer 12

How the number of organisms changes across a habitat

Question 13

What is random sampling used for

Answer 13

Is used to compare the number of organisms in different areas of the to do this we use a quadrant

Question 15

Random sample is used to sample

Answer 15

Plants or slow moving animals

Question 16

In random sample the quadrat is place in..

Answer 16

Random locations

Question 17

Why do we use sampling along a transect

Answer 17

To see how the number. Of organisms change across a habitat

Question 18

What dose the first student do

Answer 18

Removes a number from a bag
If it’s 5 example moves 5m

Question 20

The other student do in the practical

Answer 20

Pick a number as well 8m

Question 21

Then the 3 student do

Answer 21

Place a quart by the 5m to 8m then they count the number of daisys

Question 22

How many times do they complete this process

Answer 22

10 times