Required Practicals

Question 1

What is the practical for plant and growth responses? (5)

Answer 1

1. Place seeds in Petri dishes on moist cotton wool or filter paper.
2. Allow the seeds to germinate in controlled conditions
3. Put dishes in different light conditions - from different directions
4. Leave for several days
5. Observe the direction of shoot growth

Question 2

What is the expected result for Plant and growth responses?

Answer 2

Shoots grow towards the light.

Question 3

What are CV, IV and DV for plant and growth responses?

Answer 3

IV - direction of light
CV - light intensity, temperature, number and type of seeds
DV - direction of growth

Question 4

What is the practical for reaction time?

Answer 4

1. Hold a ruler between the thumb and forefinger of the person being tested.
2. Drop the ruler without warning and record the distance it falls before it’s caught.
3. Repeat the test several times then calculate the mean distance that the ruler fell.
4. Repeat the experiment to investigate the effect of a factor on reaction time.

Question 5

What is a factor they could use?

Answer 5

Give the person being tested a caffeinated drink, wait ten minutes and then repeat the experiment.